We are getting closer to the modern piano here as damper technology keeps improving. Still playing on 66 keys, the Moonlight Opus 14 No 1 is early in Beethoven’s career; has last work will be Opus 123, Ode to Joy. Interesting to note that Beethoven was more musically advanced at 18 than Mozart at the same age. Mozart took longer to become Mozart than Beethoven took to become Beethoven.