Change the world map music
     To  change  the  world map music, all eight characters must first
join  the  hero's  group  in Chapter 5 (after defeating the Marquis de
Leon).  Change  the  music  by  changing the first member of the party
after doing so.

Chapter 1 world map music: 
     Have Ragnar in the front of the party

Chapter 2 world map music: 
     Have Alena, Kiryl, or Borya in the front of the party

Chapter 3 world map music: 
     Have Torneko in the front of the party

Chapter 4 battle music in Chapter 5 and 6: 
     Have both Meena and Maya in the front of the party

Chapter 4 world map music: 
     Have Meena or Maya in the front of the party

Chapter 5 (after defeating the Marquis de Leon) world map music: 
    Have the hero in the front of the party, with at least one other 
    party member present
    
Chapter 5 (prior to defeating the Marquis de Leon) world map music: 
     Have only the hero in the party

Psaro's theme: 
     Have Psaro in the front of the party (in Chapter 6)