USP (Unlimited Sound Project/アンリミテッド・サウンド・プロジェクト) is a Japanese sound studio.

Shigeaki Irie: representative director, producer, composer, arranger, drummer

Daikoku Azuma: producer, arranger, drummer
Hiroshi Ebihara: composer, arranger
Haruhiko Kuroiwa: composer, arranger
Eisaku Nambu: composer, arranger, guitarist
Masaaki Nishizawa: composer, arranger
Goro Takahashi: composer, arranger
Keiji Ueki: composer, arranger, guitarist

Mai Iida: produced vocalist, vocal composer, pianist

Kiyomi Asano: bassist
Misaki Aso: lyricist
ERIKO: violinist
Kyoichi Ikawa (井川恭一): guitarist
Mitsuru Okoshi: guitarist
Kyoko Osako: keyboardist