J. Roy Thomas, the head of an advertising agency, is getting headaches from trying to find a name-band for a wacky client, McKenzie, who insists on sitting in with the band. As a last resort, Thomas sends agency-employee Patricia Reynolds to Iowa to sign a little known band that features a jive-combination, The Rhythmeers. She bring them east and falls in love with the band-leader, Gabe Morgan, and his young niece Sandy. McKenzie tosses in some complications but everything is smooth before the ninth song is heard.