Japanese site has music!
http://www.smashbros.com/jp/music/This is what Google Translate came up with:
Kumite
Source: Original
Arranged in charge: Yoshito Yano
Battle! Trainer (Pokemon X · Y)
Source: Pokemon X · Y
Arranged in charge: Yuzo Koshiro
Part 2 train field
Whistle / The Legend of Zelda Legend of Zelda: Earth: Source
Michiko only be: arranger responsible
Musicians who worked on the new arrangements of songs recorded in the 3DS version
Movies main name
ACE Zenobureido (/ CHiCO Mori and Kudo)
One Piece Eiichiro Oda supervision of "ONE PIECE Exhibition" Original video x x experience
Masato Koda (Wave design) Monster Hunter series (unmarked ~ P2nd)
El Shaddai Ascension Of The Metatron
Masashi Hamauzu Final Fantasy XIII
Saga Frontier 2
Kenji Ito Romancing Sa moth Series
Puzzle & Dragons
Iwadare Noriyuki Ace Attorney 5
Grandia
Shota Kageyama (Game Freak)
※ current affiliation SPICA MUSICA Pokemon X · Y
Pokemon Black Version and White
Labyrinth of the (Ancient) World Tree Yuzo Koshiro
Wangan Midnight Maximum Tune-
Yasunori Mitsuda (Procyon Studio) Chrono Trigger
Inazuma Eleven
And (Shachu be made) Wild Arms Michiko only made
Workshop engraved with Nora
Keiichi Okabe (MONACA) Nier Replicant-Gestalt
Tekken series
Sakamoto Ei-jo (noisy cloak) 討鬼 transfer
Time Travelers
Sakuraba integration Tales of Series
Dark Souls Series
Tetsuya Shibata (unique notes) Devil May Cry 2, 3, 4
Merck Storia
Yoko Shimomura Kingdom Hearts series
Mario & Luigi RPG series
Masashi Takada (Sound Prestige) Dangan refute Series
Earth Defense Force series
Yusuke Takahama (target entertainment) Digital Pinball Last Gladiators
Super Smash Brothers X
Hirokazu Tanaka disk system version of Metroid
Dr. Mario
Kumi Tanioka Final Fantasy Crystal Chronicles series
Ragnarok Odyssey Series
Nobuko Toda (FILM SCORE LLC) Metal Gear Solid 4
Time Scoop Hunter
Shohei Tsuchiya (Taito / ZUNTATA) Darius Burst Series
Groove Coaster Series
Asahi Atsuko (Nintendo) Ma
Seems it's mostly a list of credits, NOT a list of music...still, lots of good talent in there...
EDIT: english version.
http://www.smashbros.com/us/music/EDIT:..
GUYS. WE WON.
KLONOA.
IS IN SMASH.
Sorta.
check the credits of the composers-
Yuji Masubuchi (BANDAI NAMCO Studios Inc.) Taiko: Drum Master series
Klonoa 2: Lunatea's Veil
It's more of a small nod than anything, but it seems they've actually acknowledged him...to a certain extent. yay!