This was a piece I uploaded for the SoundClash challenge.
How it was done (In brief)
1. I downloaded the sample tracks from the SoundClash site (that was the requirement for that particular challenge)
2. Imported the tracks to GarageBand
3. Played an sampled a guitar track (using an actual guitar)
4. Edited and added in sound effects from GarageBand loops, like the rolling waves, crickets…