William Shatner has the most experimental, wild Spotify I've ever seen. If you haven't ever seen it, look at his discography. He does a lot of almost spoken-word poetry over soft rock, punk, etc. You get the sense that he views acting as his side hustle and is waiting for his musical career to take off.
His rendition of “Common People” is my favorite cover and I honestly prefer it to Pulps original.
At one point he was huge into the paintball scene as well. Beyond hobby level
There's also the time he did spoken word Slim Shady for Futurama
He's also (to my knowledge) one of the only major Hollywood actors to ever star in a movie filmed entirely in esperanto. I've heard that the pronunciation is rather rough around the edges though I have no way of corroborating that.
https://en.wikipedia.org/wiki/Incubus_(1966_film)