Sorry , I misspokeBeethoven is not purely atonal , just . well , multiharmonic . I ' m unfamiliar with Prokofiev and Ligeti , but Lizsthis music is just as . free when it comes to harmony . Sure Beethoven was harmonically curious , however the style he lived inlate classicalearly romanticseems to allow more free harmony . In Mozart ' s music we see a ton of sharps and flats where , in the Baroque era , they were not as common in music . Say you ' re in D minor , and all of a sudden Mozart hits you with a D #. I digress , sorry . Yes , the second half of 9031 is quite an interesting one it ' s akin to the first part of 542 . We see keys that have no relation to the tonic , but Bach handles and introduces them quite differently . Beethoven states new keys without preamble .