i love this film and see this evening on a movie theatre big screen . the audience laugh out loud at some very interesting thing and and the fast pace be most enjoyable . i do and a a singer and musical director and question one section of roby keeler vocal in by a waterfall . the key modulate and and she be suddenly sing much low and in a very mellow voice that bore no resemblance to the somewhat tin like high twitter voice she use in all her other vocal . do anyone know if this be overdubbed by another singer . it sound it to me . i would love to know . thanks so much .