How do you purchase songs?

[canEHdian131]

There's some songs that say "not purchased" does that mean you have to pay money for them? Or is it with the credits you earn from playing the game? I found the FFR shop thing but there's only 5 songs you can buy in there with your credits... is there somewhere else to buy the rest of the songs??? (I'm playing FFR Online, if that makes any difference)

[Doug31]

There are only 5 purchasable songs, and you purchase them with the credits you get for playing FFR.