Well, the good think about T&R is that you can also fill the tags from the filenames by creating a format string for selected files.
so if you have a whole bunch of files that are like (Artist) - Title.mp3, you can create a format string like (%1) - %2.mp3 and have the values filled in. If not, then get to work on the tags, you really need a clean library with tags to do useful stuff with your music.