Dragon Quest 4: Chapters Of The Chosen Codes -

Alternate music on world map:
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 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.