Have all eight characters join your party after defeating the Marquis de Léon in Chapter 5. Have the indicated character placements in your party to hear the corresponding music at the world map.

Chapter	How to unlock
Chapter 1 World Map music	Ragnar at front of party.
Chapter 2 World Map music	Alena, Kiryl, or Borya at front of party.
Chapter 3 World Map music	Torneko at front of party.
Chapter 4 Battle Music	Meena and Maya at front of party.
Chapter 4 World Map Music	Meena or Maya at front of party.
Chapter 5 Starting World Map Music	Hero at front of the party with one or more characters.
Chapter 5 Ending World Map Music	Only hero in the party.
Psaro's Theme	Psaro at front of the party in Chapter 6.