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Apple's music app may get the novice tag, but Garageband can do more than you think it can. You have access to a wide range of instruments that you can play via the iPad's multi-touch input. There's also the ability to have a Jam Session where you connect to up to three friends via Bluetooth or Wifi, record the music, mix and edit, and then share it via Facebook or YouTube. If you have little to no idea how to play music, this is the app you want.