Surprisingly enough, music's a medium he's largely stayed out of. IIRC, he retweeted something that compared #BernieOrBust people to "The self-righteous DIY Punk guy who never grew up." (Well, time to spam Fugazi at him until he cracks), he apparently likes Springsteen, but disagrees with him championing the common man (OFC), and he said in his Titanic video that movies need more end credits ballads like "My Heart Will Go On".
But if I had to guess what music he listens to on a regular basis, I'd imagine he listens to a lot of 80s pop/rock that people like my mom listen to and maybe old NES soundtracks.