From Mark Evanier’s blog newsfromme.com:
Today's Video Link
In the late sixties/early seventies, there were comedic treats for those of us who lived in L.A. and were smart enough to find our respective ways to KRLA on the local radio dial. Today, that station is a mess of second-string Limbaugh wanna-bes but back then, it was a solid Top 40-style station that didn't limit itself to the Top 40. And in-between the hits, one could often hear comedic brilliance from a group called The Credibility Gap that produced little segments and drop-ins. The membership of the troupe changed from time to time but the four main guys I recall were Harry Shearer, Richard Beebe, David L. Lander and Michael McKean. They did very smart, funny comedy that is still being ripped-off now and then by others.
This is Shearer, McKean and Lander from a 1975 episode of Tom Snyder's Tomorrow Show with Shearer doing his spot-on impression of Mr. Snyder, which I always found superior to the Aykroyd version. The group disbanded soon after this, though they occasionally reassembled or worked together in other ways. McKean and Lander were Lenny and Squiggy on Laverne and Shirley, McKean and Shearer were members of Spinal Tap, etc. Here's a ten minute clip that shows you the kind of thing they were doing back then...