Hi,
So many of the downloaded MP3's are of variable quality, due to many factors, one of which is the encoder used, a utility I have used for some time now is ENCSPOTwhich produces an Explorer like listing showing many features of each MP3 in any specific folder.
Interested then try...
http://www.guerillasoft.com/Encspot/
Sorry I'd post it as a link if I knew how...
Snark.