The iTrack Dock by Focusrite allows you to record your very own music by connecting to your iPad and instrument. There are connections on the dock for the guitar, microphone, or MIDI controller. The iTrack Dock is compatible with much of the existing audio apps on the market such as Auria, Cubasis, and GarageBand among others. It has its own recording software that also enables you to master and share your work with others.
The Focusrite iTrack Dock is available on Amazon ($200 USD).