Songs
- OyasuminasaiKen Hirai
- Half of MeKen Hirai
- OnininarimashitaKen Hirai
- ItemotattemoKen Hirai
- Poliesuteru No OnnaKen Hirai
- orthodoxKen Hirai
- Bokunokokorowo TsukutteyoKen Hirai
- KAIBUTSUSANKen Hirai feat.AIMYON
- 1995Ken Hirai
- Fake Star Ken's Swingin' JazzKen Hirai
- Kimino Sukinakoto [Less Vocal]Ken Hirai
- UtsukushiihitoKen Hirai
- Kimino SukinatokoKen Hirai
- HugKen Hirai
- TameikikippuKen Hirai
- Pop StarKen Hirai
- Negative BoyKen Hirai
- GiftKen Hirai
- Emmm...Ken Hirai
- Dance with YouKen Hirai
- BlanketKen Hirai
- Ready for Your LoveKen Hirai
- NonfictionKen Hirai
- マホウッテイッテイイカナKen Hirai
- TimeKen Hirai
- Plus OneKen Hirai
- GrotesqueKen Hirai feat. Namie Amuro
- CandyKen Hirai
- CanvasKen Hirai
- Fake StarKen Hirai
- ElegyKen Hirai
- Bye My MelodyKen Hirai
- Aini KodawareKen Hirai
- Ken Hirai 20th Anniversary Mega Mix Vol. 2Ken Hirai feat. Namie Amuro
- Shiranaindesho? [Less Vocal]Ken Hirai
- Catch YouKen Hirai