Various, Flatt & Scruggs, The Village Stompers, Billy Walker, The Back Porch Majority, Chad & Jeremy, The Brothers Four, The Pozo-Seco Singers, Simon & Garfunkel, Carolyn Hester, The New Christy Minstrels

Detroit Proto-Punk

Pull this thread and you get Michigan guitar noise from 1969 ballrooms to 1999 basements, unbroken.

San Francisco Psychedelia

Ballroom bands who stretched blues and folk into twenty-minute jams, pressed before anyone edited them down.