What's Happening!! (1976)

S02E17 Doobie or Not Doobie (2)

The bootleggers pressure the guys into secretly recording the concert, but as the crowd goes wild, the tape recorder slips out from beneath Rerun's coat and becomes visible to the Doobie Brothers. After some quick clarifications, the group teams up with the Doobie Brothers to devise a plan to catch the bootleggers red-handed.