I have it on good authority that the Purple Gang was an incredible rhythm section, prior to and during their incarceration
Rob:Earth, Wind and Fire. The Ohio Players.
I am down with most of the nominations in this thread. Some absolutely great mentions but no Allman Brothers Band? They were/are a groove machine. Throw in the related Gov't Mule (Woody-era) and Derek Trucks Band, too. Also, Geezer and Ward from Sabbath were ferocious. And for those SST kids out there, Watt and Hurley ripped stuff up but were still rock solid. RIP D. Boon.
ABB just about any incarnation especially w/B. Oakley & Woody... Mule w/Woody and Matt Abts.. & Little Feat w/ Richie Hayward and Kenny Gradney would be my #1 pick though..Feats Don't Fail Me Now!!!
Oh, don't forget Teddy Pendergrass:Rob:
...and I'll add ELO, Alan Parsons Project, Spyro Gyra, Pablo Cruise, Boz Scaggs and Bob James!
"Listening to music can chase away the stress". Author Unknown
Hard to go wrong with Little Feat. Another band from that era: Sea Level. Kind of a cross between ABB and Steely Dan.