From season 5 of Laverne & Shirley:
An annual tradition of the series was the Shotz Brewery's annual talent show, which was an excuse to give Lenny & Squiggy (Michael McKean & David L. Lander) an opportunity to sing. The tradition was terminated when the cast relocated to Los Angeles.
From December 1979, the guys are joined by Laverne & Shirley (Penny Marshall & Cindy Williams), wearing gold lame outfits that look like they were inspired by some of the Sha Na Na crew, for a cover of Danny & The Juniors' "Rock & Roll is Here to Stay". Future Spinal Tap member Christopher Guest, who also appeared with Lenny & The Squigtones on American Bandstand, sits in.