It's only recently I realised how soulful the lead vocal is on Elvin Bishop's Fooled Around And Fell In Love. And it's to my shame I've only just found out who the singer was - Mickey Thomas, later of Jefferson Starship, a band I have no time for at all. The record was a 'turntable hit' in the UK, getting lots of plays, but was not a big hit. And it still gets played today.
Hall and Oates were just getting going in the Seventies, anybody else spring to mind? The Sixties gave us the Righteous Bros, PJ Proby, Shades of Blue, the Magnificent Men, Dusty and many more, what about the 70s.

Here's Mickey and Elvin:
http://www.youtube.com/watch?v=Nvglqc3QYq8