There was 12 notes in Western music before 12 equal divisions. This Mozart piece...

There was 12 notes in Western music before 12 equal divisions.

This Mozart piece played in mean-tone temperament (historically accurate) has better tensions and resolutions than the equal tempered version.

(The chipper ending to this piece is believed to be not written by Mozart.. the song was incomplete when he died.)

I even prefer Chopin in unequal temperament, but I'm not as confident about whether Chopin used 12 equal divisions.