Many people appear to label their MP3 files with trackname only, ie "03 Summertime.mp3", so if LimeWire only used that, it search results would be much more limited and imprecise; you couldn't search for music by a given artist or from a specific album.

To repeat: As a search engine, LimeWire will never be any better than the quality of the data (in terms of organization) that is offered on Gnutella. That is why it is important that the ID3 tags are filled out correctly. I also think it is useful but to include the artist's name in the filename, but I seem to be in the minority. Have you ever browsed someone's machine whose MP3 files labelled by song title only? A nightmare!