How this game works you download a song you like and then you basically hit circles, drums, piano, etc to have a high score with the game. Yeah it's kind of like what you do in guitar hero ex you don't look like you're playing a guitar. https://osu.ppy.sh
The other platforms you can play this game on is Android (starting 2.1), OS X, iOS (App Store), and Windows Phone. https://en.wikipedia.org/wiki/Osu!
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I love Osu! I play it everyday, I even got a pen tablet for it ^_^ Very fun game, I recommend it.1