Like the previous games, Pokémon X & Y includes several alterations to music. However, for the first time ever, the music can be customised in some circumstances

In-Game Music Changes

In a variety of places around Kalos, you can speak to people and they will change the music of the game temporarily. This changes the music to be music of a past game, or allows you to select a variety of pieces
AreaMusicScreenshot
Lumiose CitySelection of Musical Pieces for Trainer PR Video
Coumarine CityChanges to music "Got to Get to it" from Black & White
Snowbelle CityChanges to music from Jubilife City
Kiloude CityChanges music in Battle Maison

Battle Music

When you go to battle a friend, if you set the game up, you can also select Music. You start off with four pieces, but as you battle more online, you unlock more pieces of music. This can all be controlled by tapping the bottom screen as you prepare for the battle

Music NumberMusic Piece
Music 1Trainer Battle
Music 2Wild Encounter
Music 3Rival Battle
Music 4Gym Leader Battle
Music 5Gym Leader Remix (Successor Korrina Battle
Music 6Team Flare Battle
Music 7Lysandre Battle
Music 8Legendary Battle
Music 9Kanto Legendary Battle
Music 10Elite Four
Music 11Champion Battle
 
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