Editing Sounds 

Starting Up	Using Loops	Using Software Instruments
Using Real Instruments & Vocals	Mixing Your Track	Exporting Your Track

You can create Software Instrument tracks with the pre-recorded instrumental sounds such as piano or saxophone, inside GarageBand. They can be played with a separate keyboard or with GarageBand's on-screen keyboard

Watch the movie to find out how to record a Software Instrument into your GarageBand project. Follow the instructions carefully.