It's possible to learn to play any of these songs just by playing the game. It's all a matter of repetition. If you play along with the game enough times, of course you're going to remember it; to be able to play it even when not playing the game. What this game WON'T do is teach you to play *any* song at all. It teaches you how to play the guitar and the songs in the game, but not how to read music.
I can play many of the songs on here. It actually teaches you the real notes. I have been playing guitar for 8 years, and my girlfriend just started... at our different levels this game is enjoyable for both of us. Whether you've been playing for years, or you've just picked it up- this game is for you.
I have learned much more, much faster, than I ever thought possible...and having fun while doing it. I've been having so much fun with the game I've bought myself a second guitar (I already had a Squier Strat and just bought an Epi Les Paul LP100), an amp, and am playing both with and without the game now. Can't say enough about how much this game has peaked my interest in guitar!