Katsuhiro Hayashi is a former Sega sound composer. He left around the same time as Koichi Namiki and Jouji Iijima, both guitarists from the now defunct S.S.T. Band, and would work with them (especially the former) on occasion.
While working at Sega, he was best known for composing the music for Quartet and SDI. Following his departure, he joined Media Rings and composed music for a few SNES titles. He then became the main composer of the Yuukyuu Gensoukyoku series.
Katsuhiro had this to say about his Sega Master System music:
- iris.dti.ne.jp/~haya-c/qchan/katsuhiro.html - Official.