I edited the website banner a bit to show all games from the MUSIC series in it. They are all in order of release and all versions are included, from PAL to NTSC, if applicable, and for each platforms. You may need to press CTRL+F5 to see the change, though.
If there appears to be more than you thought, remember that Music 2000 and Music 3000 were released in North America as MTV Music Generator and Digital Hitz Factory, respectively (in english only).