unlockable songs?!

[benny196]

well i saw some not available songs and i only see 5 songs in the shop how can i unlock all these great unlockables?

[lightdarkness]

There is a secret section, one of the genreas, you need to get lots of credits to get these songs.

[ImEric12]

all the other songs Not Available just means that there is no song there, aside from the ones in the Secret and Purchased sections.