In the Groove (1941)

This Name Band Musical short from Universal (production number 6222) features Freddie Slack and his orchestra, with Martha Mears the featured singer. The Tanner Sisters (Betty, Martha and Mickey) also have a song, and Sunnie O'Dea dances, as does The Knight Sisters, an adagio dance team. No Universal short was complete without some kind of vaudeville act tossed in, and the tossed-in act here is a roller-skating team called The Lightning Trio.