The lead singers looks a little like Scholes....
Is the lead singer Brian Auger?

The backup singers.... Fwock knows who they are..... uuummmm!! gonna take a shot at it and say the girl is a young Bette Middler.

The guy I wanna is.... Damn! this is probably gonna make you laugh but I wanna say it
it's Rod Stewart.

Though I don't remember Rod being in any bands.... ahhh!!!