My favorite Kozo are the ones not under his name...
Like Say...
And Real ~L Size no Yume~
I think he also composed/helped out with Libra...
Also, Ritter (The Legend) is Kozo + Some Vocalist...
But anyway, list of Kozo songs NOT under his name: (from
Japanese Wiki
* BLIND（有待雅彦）
* HIGH (Nitza Melas)
* ROCKIN' PARADISE (Thomas Howard Lichtenstein)
* BRING BACK (Kevin Vecchione)
* SWEET FERINE (Anna Vieste)
* SUZY AND THE TIME MACHINE (Thomas Howars Lichtenstein)
* Utopia（寺島純子）
* Country day (Anna Vieste)
* Libra (Thomas Howard Lichtenstein)
* Electric Sun (Anna Vieste)
* HOLIDAY（らく楽器隊2003） - 『らくがきっず』のBGMのアレンジ
* Real~Lサイズの夢~ (MAKI)
* Say（TOMOKO MIWA）
* 無常の星（P-Bombers） - 肥塚良彦、Jimmy Wecklとの合作
* The Legend (Ritter) - Naya~nとの合作、柴田浩之と東京工業大学混声合唱団コール・クライネスが歌唱参加
* Spellbound (Anna Vieste)
* On Cloud Nine (Brian Smith)