You can listen to all of the game's music on infinite loop at the Main Menu by pressing LT and RT to cycle through the tracks.

While holding UP, select your character with any button to use a different costume.

ACHIEVEMENT - HOW TO UNLOCK
Stage 1 Complete (20 points) - Complete Stage 1 of Arcade Mode (any difficulty).
Stage 2 Complete (20 points) - Complete Stage 2 of Arcade Mode (any difficulty).
Stage 3 Complete (20 points) - Complete Stage 3 of Arcade Mode (any difficulty).
Stage 5 Complete (20 points) - Complete Stage 5 of Arcade Mode (any difficulty).
Ring Out (40 points) - Win a round by ring out in Arcade Mode (any difficulty).
Excellent (40 points) - Win a round without receiving any damage in Arcade Mode (any difficulty).
Certifiable (40 points) - Play Ranking Mode in Arcade Mode (hold down P+K+D+START during Attract Mode).
Expert Mode (40 points) - Enter ???????? at the character select screen in Arcade Mode.
Dural (60 points) - Use Dural in Arcade Mode or Offline Versus (In Ver.2.1 hold START when selecting a character).
2.0 (20 points) - Play Arcade Mode or Offline Versus in ver. 2.0.
Sudden Death (60 points) - Play the Sudden Death stage in Arcade Mode or Offline Versus.
Class of '94 (20 points) - Select game settings in Arcade Mode while holding the X button to enter Attract Mode.