I belive all of that info is stored in meta files on the music file, and the programs read the meta file and search for the best matched information. So you have to put in most of the information yourself before the programs will work.
Yeah well they all have Artist - Song info but I want to more easily add the Genre, year, and album info as well as coverart without doing each one manually. I have tried a million programs but thought there may be one out there that actually gets more than 1 out of 10 songs correct automatically.