Namie Amuro
Grotesque (feat. Ken Hirai)
Hirai Ken
My Way (Frank Sinatra cover)
Ken Hirai
Okina Furudokei
Ken Hirai (平井堅)
By My Melody
Boku wa Kimi ni Koi wo Suru (Give My First Love to You/Я дарю тебе свою первую любовь)
Ken Hirai
I Love You -less vocal-
Ken Hirai
fake star(instrumental)
Ken Hirai (平井堅)
I'myourdog
Ken Hirai
Okina Furudokei
Ken Hirai
Shiranaindesho?
Hirai Ken
Boku wa Kimi ni Koi wo Suru
Ken Hirai
Hitomiwo Tojite