Yeah I thought the re-scan would be part of pulling the music back into MusicBee since I had completely deleted them in the first place before changing info in another program. I deleted them from the library, closed out MusicBee, changed them in the other program, restarted MusicBee and then re-scanned them back into MusicBee and had not changed the info again outside of MusicBee. Some of the files still had the old genre listed. But at least I figured out how to get them to update again from within the program.