Looking For P2P File Sharing Information

I have two teenage sons that are anxious to start downloading music files using a filesharing service.  This is something that I have never paid much attention to, but now I think I should take the time to learn a little more about p2p file sharing.  From what I understand you download the software the service provides and then you ae able to search the network and find files that other users have posted for sharing.  It looks like the process is pretty easy but I am a little concerned with the legalities of this practice.  I don’t want to get into trouble with this.

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