Ok, I wanted to know how many entries were in the same bracket as mine, so I figured out which files are in which brackets. And since I'm nice, I decided to share. Have fun.
Oh, and congratulations to the two keyboard entries. You passed the challenge round already.
KEYBOARD:
Arti - Paranoia Sky
Eggman - Domino
IN THE GROOVE:
Akira - Inner Universe
alphabet55 - Jum
discovolante - Little Little Princess
hamm - Together
Ike Pie - Tori no Uta (Noise Rave)
jammitch! - Kagekiha
Rob00996 - Video Out C
sanchny - DREAM OF YOU
Xythar - Inspiration
DANCE DANCE REVOLUTION B1:
alphabet55 - 24
Ike Pie - Have you ever been Mellow
jammitch! - Identity
PkerUNO - Emoticons
sanchny - Disco Dog
Blox/TheBaldOneMpls - Gasolina (Delaction Remix) (Solo Style)
the_ditz - Fuku Wa Uchi
DANCE DANCE REVOLUTION B2:
#Infinity - fffff
Akira - High School Love
Dark Luke - Over There
pokecapn and Azure Haights - Radio Star
Shortysnmn2010 - Bad Boy (Alex M vs Marc Van Damme Remix)
will-i-am - Love is Eternity (SF Synth Trance Mix)
zeh - Samba Brazil
Let me know if I got anything wrong.
(edit: fixed, pokecapn. Sorry Azure Haights...)