The essence of music is interaction. You can add tension to your song and create the impression of musicians playing together by playing different melodic loops one after another. This is known as "call and response."
You can stretch your melodic loops to match the song length, and then divide them into separate regions. You can cut and paste these regions to create the effect that the loops are answering each other.
You can create the sense that your loops are building a larger piece of music by placing loops that use the same instrument in sequence.
Making Your First Song with GarageBand
Creating Your GarageBand Project
Starting Your Song with a Beat
Creating Drama with Call and Response
Setting the Tone for Your Song with an Introduction
Adding Interest with Key Changes
Playing a Software Instrument with Your Song
Recording Software Instrument Tracks
Making Changes to Software Instrument Tracks
Recording Real Instrument Tracks
Making Changes to Real Instrument Tracks
Recording Your Voice or an Acoustic Instrument with a Microphone
Planning Your Podcast Recording Session
Recording Your First Podcast Episode
Polishing the Sound of Your Podcast Episode