Which brings to mind the question: How many rock stars are programmers? There are quite a few coder-artist types, thanks mainly to Processing, but I've yet to hear about a coder rock star (let alone, of course, a coder ninja, but those are, you know, reclusive by nature).
Personally I think Rundgren is an acquired taste, like Zappa. But give it a shot. He's also produced some amazing albums for other groups (XTC's Skylarking being my favorite).
I wouldn't call them stars, but I know at least two programmers (assuming one hasn't moved on to managing programmers) that play in rock bands. Does that count?