Stage 2. And I'm pretty sure T's Music is more generic then a rock band, since, they did alot of the music for later Turbo games, that were not rock, not to mention the music for Bonk for NES. So, it's probably some faction within T's Music that was responsible for the more rock oriented stuff, including Cotton & Dungeon Explorer 2, while, not rock, did use guitars n' stuff.
Oh yeah, they also did Riot Zone.
You know what, I think they also did Super Darius 2, which was made, not by Hudson, but by NEC Avenue.