This is actually a great approach . <| sep |> Grapes are sour my friend Thanks EU <| sep |> 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 . Yes , Liszt is a whole lot freer with is harmony but even then , most of that music is still not at the level of dissonance that we see in the works of twentieth century composers anyways very late Liszt might be an exception . 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 , but I would argue that that would not have been a reason for Bach to dislike their music . Consider the first phrase of the B minor fugue from Book I of the WTC . The stuff that Bach hits you with in those first two measures makes a D # in D minor look quite tame . In fact , it ' s not Mozart ' s habit at all to randomly introduce isolated dissonances that are not used for any further harmonic purpose such as a transition between keys .