How Many Songs are Available to Playtest/Peer Review?

[Shadow2222]

I'm sure the answer is right in front of me, so I apologize if I'm reiterating an already answered question, which is...

How many songs (approximately) are available to playtest/peer review right now?

The reason I am asking is because I am thinking about getting an XNA membership, but I am really short on money. The only thing I would be doing is playtesting songs, so I don't want to buy it if there are only 20 or so songs to play at the moment.

Also, out of curiousity, what happens when a song is approved? Is the .rba/.rbs file taken out of wherever you get those from?