I don't know how Oz would sound like if He started singing. But I think He'd sing as great as Spike probably!

I thought this question would be about what sort of style/genre he'd sing, not the quality of his singing, and my opinion that his musical style would be quite similar to Spike's.

I'm not sure how his singing would be. I guess it just depends on what Seth Green's voice is like in reality, doesn't it?

I don't know if Seth Green can actually sing in real life but I wish Oz was in Once More With Feeling!