Apologies if this has already been shared/covered. There are two "Global Rhythm" sets available (free) from Casio for MZ-X300/500, 40 rhythms and 20 rhythms respectively, here:
http://support.casio.com/en/support/download.php?cid=008&pid=1252
After downloading and installing, ensure you hit default the tempo (press Tempo up & down buttons simultaneously) for each pattern, and try the Intro 1 on both minor & major chords for clues on potentially compatible songs/genres.