These are all 256 songs as of Version 3.12.1. Unreleased songs are under the Misc. section.
88 songs in all IAP packs.
48 songs without IAP packs.
23 songs free, 25 premium songs.
106 event songs, 11 Wave Test songs, 2 live event songs unlockable with Frags, 1 live event songs unlockable by purchasing items online.
Level cap for non-premium users is: 30