Maniac mode:
Clear all twenty songs in both basic and trick modes and save the game to a memory card. Note: It is best if you have auto save enabled, as the game save your stages as you go along. When you finish all songs, start the game again (after you are sure those forty stages are saved). To be sure, check the records -- if you have a letter for all of the songs then you have done it correctly. When you choose the difficulty a "Push Down Twice For Maniac Mode" message will appear when you have the red stars. If you want maniac mode for double, do exactly the same as for single player.

Macarana song:
Complete all songs in maniac mode with an "AAA" rank and to unlock the Macarana. Note: This song is the only hidden song you can get.

Hint: Songs that are not from Disney mix:

B4U
Let The Beat Him Em
Higher
My Fire
Saints Go Marching In (Remix); Japanese version only.