What are /r/musicwriting's favorite Products & Services?

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Um, don't you already have Garageband on your Mac?

If you for some reason don't and can't get it (thought it was standard), check out Soundation. It's a very good way to learn the ropes and you have access to their free library of loops.

Seriously though, look for Garageband in the Applications folder. If it's not there, check the system disks. It may not have been installed as it might be considered an "extra."