The Mamas and Papas
which or course leads into
Wilson Phillips
there is a GREAT episode on the M&Ps in Andrew Hickey's the history of rock and roll in 500 songs podcast
it's named "San Francisco" and starts with "eve of destruction' before getting in to the m&ps. it's amazing how big an impact they had and other things around Montrey pop fest
and how lame they were to Michelle Phillips and Cass (who really was probably the most important person, yet constantly derided)
changed music