Ok, after a few days of deep thinking I arrived at what I would consider the perfect tribute album:
Ziyouvachi: Kabukichou no Jou
Aimer: Gips
Itsue: Memai (it would probably be my favorite track of this album)
Minami Kitasono: Aozora
Nakashima Ko: Honnou (he is the only one who could make it right
)
Kazuya yoshii: Tsumi to Batsu
Show-ya: Kuki
Tokyo Girls Style: Meisai (the somewhat mandatory idol track)
Tatsurou Yamashita: Suberidai (this song would sound good with so many artists doing it, but he is the one who would deliver it better
)
Kazuho Oogiya: Torikoshi kurou
L'arc en ciel: Gamble
Aiko: Koko de kiss shite
Utada: akanesasu (only if she did a RnB cover)
Petrolz: Tsukimi Asobi (don't deny! If they did a funky cover of this song if would be pretty awesome!)