Ok, heres a possible way to avoid getting sued by any of the RIAA.
This is gunna be a bitch for anyone with thousands of Tunes, but for people with a couple of Hundred or less.
Simply change the names of the files to sumthing different,
Eminem - Lose Yourself >>>>>
Nem - Yself
That way if you were eva caught you could simply say that you didnt know the file you downloaded was, what it was ( A Copyrighted song)
Also the RIAA wouldnt recognise the song titles either.
As i said if you have loads of tunes his would take ages, but it could be worth it.