Songs

• cry and smile
• egao
• Grotesque (グロテスク)
• OST Boku no hatsukoi wo kimi ni sasagu
• 瞳をとじて

Ken Hirai

Other Musicians

• Chico Buarque
• Assi El Hellani
• Andy
• Edward Maya
• Ingrid Michaelson
• 10cc
• Kaizers Orchestra
• Luca Carboni
• Christos Menidiatis
• Sofia El Marikh