If you've ever dreamed of being a rock star – really, who hasn't? – then you'll want to get GarageBand ($5), the awesome Apple app that turns your iPad into a music studio. Strum chords on an electric guitar, bang drums on an electric drum kit, play bass or the piano. You can create songs, share songs, have a jam session. Of course, it's not the real thing. Then again, you're not really a rock star.