Takayuki Nakamura is uncredited, but an interview with RocketBaby lists several songs he composed.
The game groups compose and Sound Effects credits together, but Hidenori Syoji is not credited for music on TYCY-5522. Instead, Takenobu Mitsuyoshi's liner notes credit a part-time worker for sound effects (Syoji later confirmed he first worked at SEGA part-time). It is unconfirmed whether or not Mitsuyoshi or Fumio Ito also worked on sound effects.