`` got ta sing , got ta dance `` includes a lot of swing from wolfe 's original whiteman and ellington charts , but the two-hour show climaxes with calloway leading a 15- to 20-minute medley , including `` hi-de-ho `` before the nicholas brothers ' dance a `` tap challenge `` and calloway joins them again on stage during `` fascinatin ' rhythm '' and `` i 've got rhythm , '' the final two numbers .