Watanabe, Michiaki
(aka Watanabe, Chumei)

1972  Jinzo Ningen Kikaida
1973  Kikaida 01
1973  Inazuman
1974  Inazuman Flash
1975  Himitsu Sentai Gorenjā
1975  Akumaizer 3
1976  Chōjin Bibyun
1977  Daitetsujin 17
1977  J.A.K.Q. Dengeki Tai
1978  Supaidāman
1979  Batoru Feebā J
1980  Denshi Sentai Denziman
1981  Taiyo Sentai Sun Vulcan
1982  Dai Sentai Goggle Five
1983  Uchu Keiji Gavan
1983  Uchu Keiji Sharivan
1984  Uchu Keiji Shaider
1985  Kyoju Tokuso Juspion
1986  Cho Jiku Senshi Speilban
1987  Kamen Rider Black (BGM)
1988  Kamen Rider Black RX (BGM)
1989  Kido Keiji Jiban

Song Collection Special - Jinzo Ningen Kikaida & Kikaida 01

Special Collectors Edition Jinzo Ningen Kikaida/Kikaida 01 25th Anniversary CD

Himitsu Sentai Gorenja Complete Song Collection

Akumaizer 3/Chōjin Bibyun Song Collection

J.A.K.Q. Lightning Strike Squad Music Collection

J.A.K.Q. Lightning Strike Squad Complete Song Collection

Battle Fever J Original TV Soundtrack

Masked Rider Black Original TV Soundtrack

Masked Rider Complete Song Collection Series 8 Kamen Rider Black

You might be able to purchase soundtrack CDs from CD Japan or Anime Jungle.