Rally mode, survival mode and 5 or 7 buttons option:
Accumulate over five hours of game play.

Hyper song versions:
Play all the songs once. Then, hold Select while choosing a song at the stage
selection screen. Note: This will cannot be done in beginner mode.

Hidden Lounge song:
Press Left, Up, Left, Up, Left, Up, Left, Up, Y, Start at the title screen. 

Hidden J-R&B Song:
Press B, Y(2), Down, R, Y, Up, Left, Left + Start at the title screen. 

Other hidden songs:
Accumulate the indicated amount of game play to unlock the corresponding song
type.

Cute: 2 hours 
New Fork: 2.5 hours 
Sexy Girls: 3 hours 
J. Garage Pop: 5 hours 
Lounge: 4.5 hours 
J-R&B: 4 hours 
Akiba: 6 hours 
Live: 6.5 hours 
Avangrade: 7 hours