Can I legally download the tracks I own from free file sharing sites?

If you are concerned about the possibility of criminal charges or a copyright infringement lawsuit in which you can be charged $150,000 per song, I suggest you simply go onto Itunes or Amazon and pay a dollar for each song you want as an mp3 file.

Technically, every example you gave is copyright infringement because they are all derivative works.

It's illegal. You have to think about it this way. The guy who uploaded the music to the server did so illegally since it's unlikely that he had the copyright to publish or distribute the music publicly. The company that enables the music sharing is breaking the law for failing to obtain distribution rights to the music. How likely is it that you are permitted to download music when all the other players are breaking the law? Apple has found a way, using their match service, to help you gain a license to music previously owned. In effect they agreed to pay a licensing fee in exchange for offering you that service.