While we're discussing Beethoven's music, I'll wager that very few if any of you have heard his two Preludes for keyboard. They were composed when he was 19. I just learned about them recently because they are included in a collection of piano preludes, some of which I practice (the more accurate term would be ruin).
I'm currently working on the first prelude, the better one of the two. Both preludes go through all twelve major keys beginning with C Major, progressing in the order of the circle of fifths, and ending in C Major. Actually, they go through 13 keys because they include C# Major and D-flat Major. I have no idea why anyone would write in C# major for a keyboard instrument considering that the same keys are played regardless of the score's key signature; the key signature in C# Major has seven sharps as opposed to only five flats in D-flat major and with fewer accidentals usually required.
I'm convinced the first Prelude was written for organ, not an instrument that we typically associate with Beethoven. That's because the codetta includes a low note sustained for a long time beneath all the other music going on above it. That note can easily be sustained on the organ but impossible to sustain that long on a piano. Especially a piano of Beethoven's time. I cheat by playing that note at several opportune, appropriate times to ensure that it can be heard throughout the entire section of music.
I wrote to my best friend from music school recently that not a single measure of the Prelude is as good as any entire piano sonata that Beethoven wrote. Even so, the Prelude is fun to play and is one of the few pieces by Beethoven that is barely within my limited technical ability.