Recht lied to Golan that Stewart "was a great singer" to convince Golan to cast her Bibi. Golan eventually noticed her poor singing, and he, as Stewart explained, "sent me to a voice coach who actually thought I was fine for the movie, but producers kind of got cold feet." Thus, Mary Hylan, a "terrific professional singer from L.A." as Stewart described her, served as Bibi's singing voice for the film. Clinton first noticed Hylan singing at a Christmas party in 1978, and "she just blew me away," he recalled.