Since 2010, GarageBand has been the entry point for bedroom producers of all stripes, and for good reason: It's the easiest way to record multiple tracks (of vocals or any instrument) on any device. If you're already familiar with the desktop version, translating your know-how to the mobile app is a cinch. To get started, simply press the "+" button, choose the type of song or instrument you'd like to record, and you're off. More seasoned producers can import locally-stored files directly into the app, then chop n' screw 'em, add filters, or manipulate them in any other way. Unfortunately, the interface can look a little jarring at first, because you have to continuously swipe between the workspace and recording screens to get anything done. However, once you get the hang of it, you'll be making masterpieces in no time.