Beyblade

Soundtrack
Put the Beyblade disk into a CD player and you can hear the tracks in the game, starting with track 2.
(Thanks to elliotl88@hotmail.com)

Unlock Blader B or Blader C in Multiplayer
Enter the tournament section. Exit, then enter multiplayer mode and you will get to be either Blader B or C.
(Thanks to elliotl88@hotmail.com)