The Sound of Music (film) of the film; the actor accepted after being assured that he could work with Lehman to improve the character; Plummer later described himself as having become quite arrogant at the time, "spoiled by too many great theater roles". Wise also spent considerable time and effort on casting the secondary characters. For the role of Max Detweiler, Wise initially considered Victor Borge, Noël Coward, and Hal Holbrook among others before deciding on Richard Haydn. For the character of Baroness Elsa Schraeder, Wise looked for a "name" actress—Andrews and Plummer were not yet widely known to film audiences—and decided on Eleanor Parker.
The Sound of Music (film) child-actors actually sing is when they sing "The Sound of Music" on their own after Maria leaves. Charmian Carr refuted the claim that the voices of the child actors were dubbed in the film and on the soundtrack. Carr contended that all of the children who are in the film sing on the track, but four other children were added to most of the songs to give them a fuller sound, they did not replace them as singers. The voices of some of the adult actors had voice doubles, including Peggy Wood and Christopher Plummer. Principal photography began on March