Yep, well.... not really singing, but spoken word. He has two albums out, his first album The Transformed Man was released in 1968. I don't have that one, but I do like his rendition of Rocket Man from that album. I do have his second album, Has Been which has a rendition of Common People and a few guest stars, like Henry Rollins in the song I Can't Get Behind That. It looks like he has a third album coming out this year. :D

Rocket Man:
http://www.youtube.com/watch?v=lul-Y8vSr0I

Common People:
http://www.youtube.com/watch?v=ainyK6fXku0

It's an acquired thing, but there's definitely some humour to it as well.