I remember a friend of mine getting that shirt a few years ago while in New York. I wonder if it has been released again or if someone has been to a vintage shop?
Anyway, the only other thing I can think of that Connor mentioned was The Flaming Lips. That surprised me since that is more of a "musicians" band. Maybe he qualifies now that he is learning guitar. I think I heard somewhere that he is friends with their manager. They have been around a long time.