Broadway producer Jonnie Demming is ready to out-razzle and out-dazzle 'em all with a new production that has everything -- except the actress Jonnie knows is perfect for the lead. Future U.S. Senator George Murphy portrays Demming in a backstager drawn from the Jerome Kern-Oscar Hammerstein II musical Very Warm for May and co-starring Ginny Simms as the actress in Demming's sights. But the film's real story lies in its supporting acts: Tommy Dorsey leads the Big Band brass, Lena Horne sings an exotic Brazilian Boogie, Hazel Scott scorches the 88, the contortionist Ross Sisters defy human anatomy and Nancy Walker and Ben Blue add their clowning glory. Lots of romp and rhythm mark marvelous time in Broadway Rhythm!