wat tnb wrote:
Well, there are such things like MusicBrainz that differentiate one song from another.
I have also thought that this would be a good idea to implement in the marketplace, since I like to download a lot of albums, but don't like all the wasted space taken up by duplicates.
MusicBrainz works essentially the same way...it's just that the database is community maintained. If there's not enough data already there, it won't be able to tell either.