If you're really serious about your music, register your stuff with the U.S. Copyright Office (assuming you're in the U.S.). It is true that everything you create gets automatic copyright protection, but registering your work(s) gives you an extra legal leg to stand on if you need to go to sue or something like that. It costs money to register every piece you make, and/or hire a lawyer to do it for you, but if that's something you want to do, having the official registration can be beneficial. For collaborations, you'd likely have to re-register a different work, with each person getting different credit parts. Not sure how that works, but a lawyer might.
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