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Intro to media files in GarageBand on Mac
GarageBand comes with a large collection of prerecorded loops, offering a great starting point for many of your projects. You can start composing a song by dragging Apple Loops from the Loop Browser to the Tracks area. Combining existing loops and other media files provides a quick method for laying down project foundations.

You can also import audio and MIDI files from the Finder, and add a movie to your project.