I've always liked Neil Young with the Shocking Pinks doing rockabilly.
I also think Maynard James Keenan's work as Puscifer is more interesting than Tool.
Rock performers that play/record a different genre
Enjoyed listening to Willie and the Poor Boys last night - Bill Wyman and a group of musicians play 50’s style music. Thinking about this I guess the same could be said for Jeff Beck’s Rock and Roll Party with Imelda May, and maybe Bruce Springsteen’s Seeger Sessions (going way back to old folk music). What other artist/s have done similar alternate genre work that you enjoy?