Superb app which turns your iPad 2 in to a fully-fledged music composition tool
License: Full commercial application
Music creation software tends to be either incredibly complex, which limits the user base to existing musicians, or very basic, opening up the software to less able musicians, but ultimately being limited. GarageBand is a an iPad app that falls neatly between the two camps, making it possible to create some truly stunning music, even if you do not play an instrument, while remaining pleasingly easy to use.
The Mac version of the app was something of a game-changer, and the iPad version frees you even further by making it possible to make music wherever you go. There are a large number of instruments built into the app ranging from guitars and basses to drum kits and pianos. Unsurprisingly, each instrument is touch powered, so you can play the drums by tapping on-screen drum, or strum a virtual guitar.