Wolf – you didn’t respond to my earlier comment.
A few additional points:
Nothing the OP said indicates any potential copying (and it should be noted he said he never yet has copied) is not of “free source” music.
Additionally, under U.S. copyright law, copying copyrighted material for personal non-commercial usage falls under the “fair use” doctrine and is legal. Even if it is one friend copying for another, without any mass distribution involved.