Not long ago, I located a clip from American Bandstand which featured Lenny & The Squigtones, the comedy band spun off from Laverne & Shirley. That clip, which has the band performing "Love Is A Terrible Thing" & "King of The Cars", is over at Saturday Morning Archives, but could also end up here at a later date.
Livingretro79 posted this choice piece of the band's best known song, "Night After Night". You can tell that Lenny (Michael McKean) & Squiggy (David L. Lander) are having fun. The live audience at the taping of Laverne & Shirley certainly was. The story goes that the roots of what would become Spinal Tap were formed here, as Christopher Guest was credited as a guitarist, under his Spinal Tap alias, Nigel Tufnel.
McKean & Lander brought their act to Albany for the local Cerebral Palsy telethon and played this song, and that was the only time I remember hearing it.
Here's "Night After Night":
Well, now you understand why Lander was hired, presumably by Jerry Lewis himself, to voice the comedy legend's animated alter-ego on Will The Real Jerry Lewis Please Sit Down, which predated Laverne by a few years.