Ice-T asked both David Gilmour and Roger Waters if they would mind it if Body Count covered the song Comfortably Numb (with a fair amount of improv).
Gilmour said yes. Roger Waters said yes. Then David Gilmour said he wanted to play on it. They performed it on The Tonight Show With Jimmy Fallon (without Gilmour) and that's how I caught wind of it.
I don't know much about Ice T or Body Count beyond the hoopla that occurred when they released that Cop Killer song and Ice T on Law and Order, but these songs are great.