At this moment I have a strong grasp of Beethoven’s personal style with harmonies and overall music structure, at least the style of early Beethoven. He tries very hard to avoid the cliché I-IV-V harmonies in classical music to the point where it almost feels forced at times. He is fond of taking you to remote keys using otherwise ordinary intervals and builds many a harmonic structure on the 3rd interval. The whole idea is to make the music dense and weighty while also expanding the overall structure of the peace by delaying IV-V-I cadences in creative ways.
– The 5th interval normally takes you to V, the 4th to IV, but Beethoven may take you to v and iv instead, the minor versions of those keys. C to Gm is one example.
– The 3rd interval normally takes you to iii or vi, which usually comes before a IV or V and then I. Beethoven takes you to a major or a minor version of those keys that is very remote. He will go from Eb to G, or C to Ab. He may even do something crazier like take you from B to Abm.
– The whole step (M2nd interval) usually takes you to ii, which resolves into IV or V and then I. Beethoven instead takes you to II or VIIb such as C to D or C to Bb.
– The half step (m2nd interval) is often used to go to the Neopolitan (IIb) before going to IV or V then I. Beethoven does that but he also likes going down a half step to a remote harmony, such as Eb to D.
– Beethoven is fond of using diminished chords and the leading tone (especially a chromatic base) to lead to a chord in an interesting way, even if that chord is common in a certain key, like C to F#d to G. He will sometimes pull a twist where the diminished chord leads to the dominant of its intended target, like C to F#d to D. During these times he may leap by a tritone, the Devil’s interval.
– Beethoven sometimes likes to mutate a chord into many different forms; such as D to Da or D7a or Dd to Dm. In this sonata he sometimes goes from Dm to Eb instead of Dd to Eb. Sometimes he will simply he happy to turn a major to a minor chord and back again, something other composers like Schubert did well. Sometimes Beethoven will even play a minor version and major version of the harmony at the same time.
– Beethoven will blend two chords together or mismatch the melody and base. This often creates a chord, like one in Eb, which can be read as Ebs4, Eb9, or Eb11. (He is also fond of minor 7 chords.) Beethoven will sometimes delay a melody, usually to keep it in the dominant of a chord, while the base will play the intended chord itself on schedule. Baroque composers often used this technique but at the end of pieces, not in the middle.
– Another trick is to play an ordinary melody yet make the harmonies going with it to be anything but.
When it comes to creating music subjects, Beethoven builds them from small cells based on intervals; in fact he builds the entire piece from these cells. Some composers are painters as Debussy, others are poets as Chopin, others are miniaturists as Scarlatti. Beethoven is an architect and sculptor, and so he builds his music brick by brick, chiseling out the raw stone of his improvised ideas until they are concise, defined, and strong. Beethoven places intervals, counterpoint, and voice leading over typical harmonies more and more as he grows as an artist so by the time he composes the Great Fugue he writes “pure interval music” as Stravinsky described it.
As for melody, Beethoven is usually careful to balance close intervals such as the step with striking leaps up or down the keyboard. He will often create the most lyrical music out of simply going up or down a scale or chord. As for large intervals, he tends to save them to help craft a distinct form to the melody, highlight a key point in the melody, or simply to strike a strong emotion.