Royalty free on hold and background music. This type of music made use for grocery stores, on hold or just relaxation. Royalty free music for electronic dance music. This music can be used for commercials, DJ's and some film and TV Over all there many.
The GarageBand software license agreement says:
'GarageBand Software. You may use the Apple and third party audio loop content (Audio Content), contained in or otherwise included with the Apple Software, on a royalty-free basis, to create your own original music compositions or audio projects. You may broadcast and/or distribute your own music compositions or audio projects that were created using the Audio Content, however, individual audio loops may not be commercially or otherwise distributed on a standalone basis, nor may they be repackaged in whole or in part as audio samples, sound effects or music beds.'
Are Garageband Loops Royalty Free Online
Free Apple Loops For Garageband
So don't worry, you can make commercial music with GarageBand, you just can't distribute the loops as loops.