ABC's Hootenanny ran into some issues over artists' political views (i.e. Pete Seeger), and ended up getting cancelled. In its place came Shindig!, which covered a wider spectrum of pop music, including rhythm & blues. Los Angeles DJ Jimmy O'Neill served as host for the series, which lasted two seasons (1964-6). Initially, it aired for half an hour on Wednesdays, but expanded to an hour by January of 1965. In the fall, the show was cut back to half an hour, but now twice a week, a la Peyton Place, and airing on Thursday & Saturday nights.
However, by January 1966, the show was back to once a week, as the Thursday spot was taken up by another twice-a-week entry---Batman.
From September 30, 1964, comes a complete episode, commercials and all, featuring the Walker Brothers and other artists who were regulars, including future bubblegum crooner Bobby Sherman, whose cover of the Honeycombs' "Have I The Right" just didn't have the zing of the original.
Could a show like this be mounted today? I doubt it, but it'd be worth a 1-shot pilot special.