Well, check out Graham Central Station (Larry Graham, Sly's thimpin' bass player) comes to mind.  Tower of Power...

There are several 'jam bands'.. the Allman Brothers, Edgar Winter, Traffic.

Check out Cold Blood, Miles Davis, 1970, Herbie Hancock...Headhunter colab..

Blues...Stevie Ray Vaughn, B.B. King, Albert King.

Soul/Funk...Tower Of Power, Impressions, Ashford & Simpson, Hall & Oats, Average White Band...

I'd like to hear Donny Hathaway, Eric Burton & War or plain War, Jimi Hendrix/Buddy Miles, of course there is always more if Bill had anything to do with it.