Heard this at work on the soul Sirius station. There are many versions of this song on YouTube but it took me a while to find the full version. Most versions fade out at 3:30 for radio or Soul Train standard format but in the original the key change comes at 3:47 when James asks the band to bring it down so he can get funky deep.
gotta get down and in order for me to get down we have to get in deep." -
Sir James Brown