Illusion is a 1929 American Pre-Code drama film directed by Lothar Mendes and written by Richard H. Digges Jr., E. Lloyd Sheldon and Arthur Chesney Train.

The film stars Charles "Buddy" Rogers, Nancy Carroll, June Collyer, Kay Francis, Regis Toomey, Knute Erickson and Eugenie Besserer.

[1][2] The main theme song for the film was entitled "When The Real Thing Comes Your Way" which was composed by Larry Spier and Sam Coslow.

This song is sung by both Nancy Carroll and Charles Buddy Rogers in the film.

Secondary songs include "Revolutionary Rhythm" (by Lou Davis, J. Fred Coots, Sam Coslow and Larry Spier) and "Levee Love" (by Lou Davis, J. Fred Coots and Larry Spier).