Pre-dating the Ohio Players "Skin Tight" by two years, and also twice as nasty, here is Patto and "Singing The Blues On Reds." This track is badass. Give it a spin.
The three albums released by Patto from 1970-1972, are unlike anything before or since. They aren't even like each other. Labelled "progressive," Patto served up everything from psychedelia, to jazz and funk, to straight Free-inspired blues. Each record keeps you guessing in the best possible ways. And let me go on record by saying, Ollie Halsall is a guitar god and John Halsey, aka Rutle, Barry Wom, is a monster on the kit.
Each album is represented here. Let me know what you think. I'm currently binging.