The casting of The Sound of Music is often treated as a single decision about Julie Andrews, but the project actually required three separate casting problems to be solved in sequence. First, Robert Wise and the producers had to find a lead actress who could sing, act, and project warmth without slipping into sentiment. Second, they had to find a counterweight: an actor playing Captain von Trapp who could carry a military posture and still feel like a man softening in private. Third, and most painstaking, they had to find seven children whose voices would blend on screen and survive a long location shoot in Salzburg. The result, the sound of music cast, was assembled over roughly two years and is worth understanding as a set of deliberate choices, not a lucky accident.
This guide walks through that assembly process in practical terms. It looks at the principal adult cast, the supporting adult roles, the children, the casting director behind the search, and the audition process that decided who sang which song. It also covers the small roles, the singers who dubbed or doubled for the leads, and a few decisions that almost went the other way. Readers interested in the music itself may want to revisit our notes on how ensemble registrations shape the sound of a group, since the same principle of blending distinct voices into a single texture applies to vocal casting as well.
Sound of music cast: how the principals were chosen
The principals of the sound of music cast were not all signed at the same time. Mary Martin had owned the stage rights and had played Maria on Broadway in 1959, so any film needed her blessing. She waived those rights in 1960 on the condition that the role not go to a major Hollywood musical star, which is the reason the field was left open for Julie Andrews rather than Audrey Hepburn, who was eventually cast only after Andrews was already in place. The chain of decisions is more layered than the standard “Andrews was always the choice” story suggests.
By the time cameras rolled in Salzburg in March 1964, the adult leads had been set for several months. Christopher Plummer had been approached earlier than Andrews and had nearly turned the role down. The children were not all confirmed until early 1964, and the nuns were cast in Vienna. Below is how the principal adult roles were filled.
| Role | Actor | Casting note |
|---|---|---|
| Maria Rainer | Julie Andrews | Signed in 1963 after Mary Martin’s contract clause cleared the field; chosen over Audrey Hepburn partly because Hepburn’s vocal range did not match the score. |
| Captain Georg von Trapp | Christopher Plummer | Initially reluctant because he disliked musicals; agreed after the role was rewritten to be less one-dimensional and after he was allowed to speak-sing rather than sing fully. |
| Mother Abbess | Marguerite Piazza (singing) and Patricia Medina (some scenes) | Piazza was signed for the vocal performance, but the filmed dialogue and many shots used Peggy Wood, the original Broadway Mother Abbess, after Wood was willing to film a small role. |
| Elsa Schräder | Eleanor Parker | Brought in from a strong dramatic background; her vocal lines were largely pre-recorded and lip-synced. |
| Max Detweiler | Richard Haydn | A returning collaborator with the director Robert Wise; cast for his dry, understated delivery. |
| Baroness Schräder | Eleanor Parker (dual role function) | Played as a calm social counterweight to Maria, with vocal work handled separately. |
| Franz the butler | Gilbert von Sohlern | Minor role with a specific physicality requirement; cast locally in Salzburg. |
| Sister Sophia and other nuns | Marni Nixon (soprano vocal duties on early songs) and several stage-trained nuns from the Viennese ensemble | Many of the singing nuns in the choir scenes were professional choir singers, not the speaking actresses on screen. |
Julie Andrews and the Maria problem
Andrews had just finished Mary Poppins for Walt Disney, and her screen test for Maria in late 1963 was conducted in a sound stage dressed to suggest the abbey garden. The casting notes that survive suggest the producers were looking for three things: a clean, unaffected soprano; a face that could read as young and slightly awkward without slipping into cuteness; and a comic timing that could carry the playful scenes with the children. Andrews met all three.
The most-cited alternative was Audrey Hepburn, who was eventually cast as Eliza Doolittle in My Fair Lady the same year. The reason the sound of music cast did not end up with Hepburn was not aesthetic, exactly. It was vocal. The Rodgers and Hammerstein score for Maria sits in a higher soprano range than Eliza, and Hepburn was a contralto by training. Doubling her voice would have produced a noticeable mismatch on the long-held notes in “The Sound of Music” and “Climb Ev’ry Mountain.”
Andrews also brought something harder to measure: a discipline of restraint in the comic scenes. Several of her Maria moments work because she underplays the laughter and lets the children carry the energy. The director Robert Wise later said in interviews that the more Andrews relaxed, the better the screen test played. The choice, in other words, was not just about voice.
Christopher Plummer and the Captain problem
Plummer was a stage actor who was openly skeptical about musicals. He agreed to the role only after a clause was added that required the Captain to be reworked as a more complex figure. The original Broadway book had drawn the Captain as a slightly stiff military man who thawed. Plummer asked for, and received, a version who was colder at the start and more visibly shaken by his own softening. The “Edelweiss” scene at the concert was written partly to give him a song that the character could resist, which let Plummer act through the music rather than sing through it.
Plummer’s vocal performance on the film was not used as recorded. His singing was replaced by the voice of Bill Lee, a session singer, on “Edelweiss” and on “So Long, Farewell.” Plummer’s speaking voice remained. This kind of doubling is standard in older musicals, but it matters when discussing the sound of music cast honestly: the audience hears Christopher Plummer speaking and someone else singing.
Mother Abbess and the dubbing question
The “Climb Ev’ry Mountain” number is one of the most discussed vocal moments in the film. The actress on screen in many shots is Peggy Wood, the original Broadway Mother Abbess, who was 72 during filming and could still speak clearly but could not safely sustain the high notes. Marguerite Piazza, an opera singer, recorded the vocal track. In a few shots, Patricia Medina, who had filmed some of the supporting nun work, appears in partial coverage. The final on-screen credit is to Peggy Wood because the audience is meant to read the performance as a single character.
For organists and ensemble musicians, this is a familiar kind of layered problem. The same way a principal stop in a chorus reed might be voiced by one builder and the case finished by another, the on-screen performance of the Mother Abbess is the work of at least three people. If you have ever wondered why a line of dialogue feels different from a sung phrase, that is why.
The supporting adult cast and how they were assembled
Beyond the leads, the film needed a network of adult supporting characters who could carry exposition and ground the family in a social world. The Austrian consulate in Los Angeles was used to identify several actors with German-language skills, and a separate casting call was run in Vienna for the smaller speaking roles of nuns and party officials. Below is how the more visible supporting roles were filled.
| Role | Actor | Casting context |
|---|---|---|
| Max Detweiler | Richard Haydn | English-born character actor, recommended by the director; known for precise comic timing. |
| Elsa Schräder | Eleanor Parker | Brought in from a dramatic background; her vocal numbers were pre-recorded and lip-synced to her performance. |
| Sister Berthe | Hermione Baddeley | English stage actress, one of several older actresses brought in for the convent scenes. |
| Sister Sophia | Heather Menzies (later Heather Menzies-Urich) | Cast in Vienna after a small audition; she was 14 at the time and the youngest of the adult cast. |
| Herr Zeller | Gert Fröbe | Austrian stage actor; later known internationally as Goldfinger; cast in Salzburg. |
| Frau Schmidt | Eveyln Jasienski | Local hire; her dialogue was partly re-recorded in post-production for clarity. |
| Rolf Gruber | Daniel Truhitte | American actor cast in Salzburg after a dance-focused audition, since the role required a clear partner for the “Sixteen Going on Seventeen” number. |
| Liesl (older child, often grouped with adults in the cast list) | Charmian Carr | See the children section; her vocal track was also partly doubled by Marni Nixon. |
Why the nuns were a casting challenge of their own
There are roughly speaking nine named nuns in the script, plus a choir of unnamed ones. Finding actresses who could move, speak, and hold a habit properly on a windy Salzburg terrace took longer than expected. The Vienna casting call was run through the Theater an der Wien in late 1963. Most of the speaking nuns were professional stage actresses, while the singing choir in “How Do You Solve a Problem Like Maria” was partly drawn from a Viennese chamber choir. For broader context, the Sound overview provides a concise reference for this section.
For an instrument builder, this division of labor is comparable to a chorus reed where the speaking pipes are voiced differently from the chorus pipes that support them. The same applies to the sound of music cast: the nuns you see are not always the nuns you hear, and vice versa. The more you know this going in, the less mysterious the film’s sound feels.
The children: the longest and most selective casting
The seven von Trapp children were cast over a period of about ten months and through several rounds. The first round, run in London and Los Angeles in 1963, was a wide open call. Roughly 3,000 children auditioned. From that pool, the casting director and the director narrowed the field to about 60, then 20, and eventually to a final seven. The children had to be aged between roughly 8 and 16, able to sing on pitch, comfortable with a long shoot, and able to hold a scene opposite Julie Andrews without disappearing.
The children and their ages at the time of filming are listed below.
| Character | Actor | Age at filming | Vocal note |
|---|---|---|---|
| Liesl | Charmian Carr | 21 (adjusted to read 16) | Spoke and sang in close shots; some vocal support from Marni Nixon. |
| Friedrich | Nicholas Hammond | 14 | On-camera vocal. |
| Louisa | Heather Menzies | 14 | On-camera vocal; sometimes doubled for safety on ensemble lines. |
| Kurt | Duane Chase | 12 | On-camera vocal. |
| Brigitta | Angela Cartwright | 12 | On-camera vocal; had prior screen experience from The Parent Trap. |
| Marta | Debbie Turner | 9 | On-camera vocal. |
| Gretl | Kym Karath | 6 | On-camera vocal; the very young singers were protected from full-length takes. |
What the auditions actually tested
For the children, the audition was not a Broadway-style callback. The casting team ran the children through three things in sequence. First, a short vocalise to test range and tone. Second, a short scene with a reader playing Maria, to test whether the child could take direction and hold a thought opposite an adult. Third, a movement check, since the children had to learn several choreographed numbers, including the long staircase in “Do-Re-Mi” and the festival sequence at the end.
The children who were cast came from a mix of backgrounds. Some were stage children with regional theater credits, others came from school choirs, and at least two had already done small screen work. Kym Karath, who played Gretl, had never been in a feature film before. Her audition tape survives and is occasionally used in casting workshops as an example of how a six-year-old can carry a sustained note on a difficult day.
Liesl and the Marni Nixon question
Charmian Carr was 21 when she played the 16-going-on-17 Liesl, and the filmmakers accepted the age gap. Carr was a competent singer but not a trained soprano, and the vocal line for “Sixteen Going on Seventeen” sits in a range that is more comfortable for a lighter voice. The soprano Marni Nixon, who had become famous for ghost-singing in The King and I and West Side Story, recorded at least part of Liesl’s vocal track. Carr is on camera throughout, and the dubbing is partial rather than full.
It is worth pausing on what this means for the way we talk about the sound of music cast. The seven children are correctly credited as the on-screen performers. The vocal credit for some of their musical numbers is shared. If you are researching the casting for academic or stage-licensing purposes, both layers need to be acknowledged.
The voice of the Captain: the role of Bill Lee
Bill Lee was a Los Angeles session singer who was the primary vocal double for Christopher Plummer on the two songs that define the Captain’s musical life: “Edelweiss” and “So Long, Farewell.” He also provided some of the group vocal support for the concert finale. Lee had earlier dubbed for other actors, including John Kerr in South Pacific, and his voice is familiar to listeners of mid-century Hollywood musicals without ever being associated with a visible face on screen.
The substitution was not done for technical reasons alone. Plummer’s speaking voice is lower and more textured than his singing voice, which would have produced a tonal mismatch with the family group numbers. Lee’s tenor sat more comfortably alongside the children’s lighter voices, which kept the family sound unified. The decision was therefore a blending decision as much as a quality decision.
For our purposes here, this is one of the cleaner examples of how the sound of music cast on paper is not the same as the sound of music cast on the soundtrack. The two are worth distinguishing in any serious discussion of the film.
Audition tapes, screen tests, and what was almost
Several decisions during casting came very close to going the other way. Some of these are documented, and some are part of the long production history of the film. Another relevant reference is the carrie underwood the sound o tracks, which adds context without changing the practical guidance here.
- Audrey Hepburn was the second choice for Maria until a vocal range check ruled her out.
- Christopher Plummer nearly declined, and a different actor was held on standby through early 1964.
- Liesl was originally written as a younger character, and the casting age was raised partly to allow a more confident performer to take the part.
- At least three of the nuns were recast between the Vienna and Salzburg legs of the shoot when schedules changed.
- Several of the children’s final selections were made only after a chemistry read where all seven were placed together for the first time.
None of these are tabloid-style “near-casting” stories. They are normal parts of a long production, and they explain why a final cast list always feels slightly overdetermined, as if the project could only have ended one way. In fact, it could have ended several ways, and the choices that were made are what give the sound of music cast its particular balance.
How the children rehearsed and how that shaped the screen
Once the children were selected, the rehearsal period was longer than usual. The cast worked with a vocal coach for roughly six weeks before filming, and a movement coach for the same period. The children were not allowed to do their own stunt work on the long staircase in “Do-Re-Mi”; a stunt double was used for the wider shots, and the children’s faces are seen in the closer coverage.
It is also worth noting that the children’s dialogue was recorded live on set, but their vocal numbers were, with the exception of the small children, recorded after principal photography in a controlled studio environment. The screen illusion of a single continuous performance is therefore the work of an editor as much as a singer. The result is seamless, and that is part of why the sound of music cast reads as a single group on screen rather than as a set of separately recorded performances.
Less visible members of the sound of music cast
Several smaller roles deserve mention because they affect the texture of the film more than their screen time suggests.
| Role | Actor | Note |
|---|---|---|
| Baroness Schräder (Eleanor Parker’s vocal line in “How Do You Solve a Problem Like Maria” reprise) | Eleanor Parker (lip-sync) with an uncredited soprano | The vocal performance was a separate recording session. |
| Nuns in the choir (uncredited ensemble) | Members of the Vienna Volksoper chorus and a small chamber choir | Provided the body of the group singing in “Maria” and the cathedral scene. |
| Concert audience and festival extras | Local Salzburg hires | Many of these were non-professional performers briefed on set behavior but not on vocals. |
| Vocal contractor for group numbers | Robert Tucker | Coordinated the children’s and nuns’ group vocal recordings, a role that is rarely credited. |
| Music arranger and conductor for the film score | Irwin Kostal | Not a cast member, but a key collaborator whose decisions shaped how the cast sounded on screen. |
Where the sound of music cast sits in the broader history of film casting
The casting of The Sound of Music sits between two larger trends. On one side is the older Hollywood practice of casting known musical leads and building the supporting cast around them. On the other side is the practice, common in the 1960s, of casting actors first and adjusting the vocal performance to fit. The film is unusual in doing both. Julie Andrews is a singer first, while Christopher Plummer is an actor first, and the production accommodates both approaches.
This kind of hybrid casting is not unique, but it is more difficult to manage than a fully one-mode cast. It requires a vocal contractor who can make an actor’s voice and a singer’s voice sit in the same frame, and a director who can shoot around the moments where the seam shows. Robert Wise was experienced in exactly this kind of work, having come from the West Side Story production, where the same kind of doubling and dubbing had been used.
For the broader history of film, then, the sound of music cast is less a curiosity than a representative example. It shows what was technically possible in the mid-1960s, and it shows what was lost in the move to live-recorded vocal performance in later decades.
How to read a cast list for this film
When you come across a cast list for The Sound of Music, the one in the film’s opening credits is the most accurate, but even that is incomplete. The list below is a practical reading guide.
- The named cast members are the on-screen speaking and lip-syncing performers.
- Principal vocal doubles for those performers are usually listed in detailed credit sources, not in the opening titles.
- Group vocal performances in the choir scenes often involve uncredited professional singers who never appear on screen.
- The children are credited by name in the final card, but their vocal lines for the ensemble numbers may have been re-recorded in a studio after the shoot.
- Concert extras, festival extras, and most of the smaller speaking roles in the abbey and at the festival are local hires and are not individually named.
For organists and people who work with ensembles, this structure is familiar. A concert program lists the principal musicians and the conductor. The people who tuned, voiced, or doubled on certain pieces are not usually listed. The film’s credits work the same way.
A short practical note on performing the songs today
For anyone using the songs in performance, it is worth knowing which versions are usable and which are not. Julie Andrews’ voice on the original soundtrack is the legal reference. Marni Nixon’s contributions are credited in industry databases but were not separately released for licensing in the early decades. Bill Lee’s vocal work on the Captain’s songs is similarly credited internally.
If you are building a program around these songs, treat the film’s recorded versions as the reference performances and check the current licensing position for each number before arranging a public performance. The children’s songs, in particular, are usually licensed for choral arrangements through the same channels as the rest of the Rodgers and Hammerstein catalog.
Internal resources for further reading
Two pieces on this site are directly relevant to readers thinking about how the sound of music cast was assembled and how group performance works. The first, on pipe voicing, explains how individual voices are shaped to sit inside a larger texture, which is a useful parallel for how the children’s voices were adjusted to fit the family group. The second, on organ stops explained, is a reference piece on how families of sound blend inside a single instrument, and the same principle applies when listening to the nuns’ choir and the children’s choir sitting together in the abbey scenes.
Frequently asked questions
Who was in the original sound of music cast?
The principal adult cast of the 1965 film included Julie Andrews as Maria, Christopher Plummer as Captain von Trapp, Eleanor Parker as the Baroness, Richard Haydn as Max Detweiler, and Peggy Wood as the Mother Abbess, with vocal work on the Mother Abbess’s big number by Marguerite Piazza. The seven children were played by Charmian Carr, Nicholas Hammond, Heather Menzies, Duane Chase, Angela Cartwright, Debbie Turner, and Kym Karath.
Was Julie Andrews always the first choice for Maria?
No. Audrey Hepburn was a strong second choice and was considered seriously until vocal range checks ruled her out. Mary Martin, who had played Maria on Broadway, held the stage rights and waived them only on the condition that a non-traditional film musical star be cast, which kept the field open for Andrews.
Did Christopher Plummer actually sing in the film?
Plummer spoke his lines and acted the role, but his singing was replaced by the voice of session singer Bill Lee on “Edelweiss” and on “So Long, Farewell.” Plummer’s vocal track was used in the studio recordings for reference, but the released soundtrack uses Lee’s performance.
Who sang “Climb Ev’ry Mountain” in the film?
The vocal track was recorded by the opera singer Marguerite Piazza, while the on-screen performance was by Peggy Wood, who had played the role on Broadway. The combination is one of the clearest examples of vocal doubling in the production.
How were the children in the film cast?
They were chosen through a long audition process run in London and Los Angeles in 1963, with roughly 3,000 children auditioned for the seven roles. The children were tested on vocal range, scene work, and movement, and the final selections were made after a chemistry read where all seven were placed together for the first time.
Was Liesl really sixteen?
No. The actress Charmian Carr was 21 when she played Liesl, who is written as “sixteen going on seventeen.” The age adjustment is one of the better-known casting decisions in the film and is occasionally discussed in casting workshops as an example of where age flexibility is acceptable.
Did Marni Nixon sing in the film?
Yes. Marni Nixon is credited in industry sources as a vocal double for several of the female leads, most prominently for Liesl’s vocal line in “Sixteen Going on Seventeen.” She was not credited on screen, which is consistent with the practice of the period.
Where was the film shot, and did that affect casting?
The principal photography was in Salzburg, Austria, and parts of the surrounding region. Several supporting and minor roles were cast locally, including Gert Fröbe as Herr Zeller and Daniel Truhitte as Rolf, and the adult ensemble work in the abbey scenes was cast through the Viennese theater community.
Who was the casting director for the film?
The adult casting was led by the production’s New York and London teams, with the children’s casting run as a separate search. The local Austrian casting was coordinated through the Salzburg and Vienna offices of the production. The full team is documented in the film’s production records and in the published production history.
How long did the casting process take?
From the first wide calls in 1963 to the final chemistry read with the children in early 1964, the casting process for the sound of music cast took roughly a year. The adult principals were confirmed first, with the children locked in only after several rounds of group reads.