Alternate Overworld music:
Find all seven chosen ones (Ragnar, Alena, Brey, Cristo, Taloon, Nara, and Mara) in Chapter 5. You can change the music on the Overworld by placing various characters as leader:

Ragnar: Chapter 1 music.
Alena, Brey, or Cristo: Chapter 2 music.
Taloon: Chapter 3 music.
Nara or Mara: Chapter 4 music,
Hero: New music (will play old music if he/she is only person in party)
Hint: Sword Of Malice:
In Chapter 3, Taloon's Chapter, you will work for the boss in your hometown. Keeping working until a person that wants to sell you a Sword Of Malice appears. It takes a little time to buy, he will eventually appear.

Item shop:
In Chapter 3 (Taloon's Chapter), walk around at night and you will find a man at night or day selling items.