In Hollywood, she worked with Henry Mancini and Herb Alpert, recorded for Liberty, Warner Brothers and A&M, and sang demos for songwriters.
Her singing voice was heard on the song "Hippity Hop" from the Disney album Peter Cottontail and Other Funny Bunnies.
In the Christmas special, Lester sang a powerful ballad entitled "My World Is Beginning Today" in which her character literally lets her hair down and comes to the aid of her future husband, Kris Kringle.
[4] Robie Lester provided the singing voice for Vera Ralston in Accused of Murder[5] and for Eva Gabor's animated characters in Disney's The Aristocats (Duchess) and The Rescuers (Miss Bianca).
Other credits included vocal performances in House of Bamboo and Lisbon (both as Roby Charmandy), The Three Lives of Thomasina, The Famous Adventures of Mr. Magoo, The City That Forgot About Christmas, Devlin, and The Funny Company (as Polly Plum).
She also contributed uncredited vocals to other films and television shows, and had small roles in The Sword of Ali Baba, The Ghost and Mrs. Muir, That Girl, and Night Gallery.