How do you unlock music in XIII?

Classic Fighting Games King of Fighters XIII
1

I’ve noticed watching some southtown videos that there’s a way to play some of the older music and am curious as to how you do it.

2

Seems that it’s controlled through the options menu. Type A for the regular music, Type B for the alternate tracks.

3

You can also play custom tracks from your HD.

4

Thanks for the answers guys.