Mr. Tea
Let's Talk About Ceps
Led Zep do James Brown-like and reggae-ish things on Houses of the Holy (the admittedly horrid "D'Yer Maker" complete with music-hall joke title)
Yeah, Jones and Bonham were proper soul and motown heads right from the start, so doing Brownoid funk in the mid-70s ('Trampled Underfoot' is easily in their top few songs for my money) was very much a natural progression rather than any sort of bandwagon-jumping.
And it's kind of tangential because I have no idea how popular jazz still was with contemporary black audiences ca. 1970, but there's a ton of jazz influences in early Black Sabbath, especially the first two albums.
I see padraig's already mentioned Bowie's soul/funk phase.