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.
Sites: