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Playstation 2 - Beatmania 2 DX 7th Style cheats

Unlock Abyss - The Heavens Remix song:
Finish Master's mode

Unlock Murmur Twins song:
Go to the selection screen. Play all of the blue songs

Unlock Backside Courses
Go to the Original Course Settings.
Type any of the names bellow to unlock courses

Names - Courses: 
LIVE - LIVE Backside Course 
NAOKI - NAOKI Backside Course 
BOSS - BOSS Backside Course 
D.J. - DJ Backside Course 
GOODCOOL - Good-cool Backside Course