[hpg23]

I edited my post after thinking more and... I can't reduce the list to only five haha xD


-Simple And Clean ~ Utada Hikaru (2003) [on COLORS single]
-Planetarium ~ Ai Otsuka (2005) [on LOVE COOK album]
-BUT ~ Koda Kumi (2007) [on Kingdom album]
-Automatic ~ Utada Hikaru (1998) [on First Love album]
-Konayuki ~ Remioromen (2005) [on HORIZON album]
-A Song for XX ~ Ayumi Hamasaki (1998) [on A Song for XX album]
-Tell Me ~ OLIVIA (2007) [on OLIVIA inspi' REIRA (TRAPNEST) album]
-Anna Tsuchiya ~ Kuroi Namida ~deep sadness version~ (2007) [on NUDY SHOW! album]
-Say the word ~ Namie Amuro (2001) [on Love Enhanced Single Collection compilation album]
-BLOWIN' ~ B'z (1992) [on B'z The Best Treasure compilation album]
-Sakuranbo ~ Ai Otsuka (2003) [on LOVE PUNCH album]

and a bunch more actually xD