Fun fact: Beethoven once owned a piano that had four strings per key on the higher range[1]. I'm not sure if he used that piano to compose his sonata Op 110, b

Fun fact: Beethoven once owned a piano that had four strings per key on the higher range[1]. I'm not sure if he used that piano to compose his sonata Op 110, but it has a section[2] that starts with una corda, with a very serene melody, and as it gradually picks up its energy Beethoven instructs the player to use more and more strings... an effect that's not quite possible with modern pianos as modern una corda is not actually one but two strings per key (in the middle-to-high region), and that's the only distinction we have. [1] https://books.google.com/books?id=q6oZkreoZtQC&pg=PA57&dq=beethoven%27s+pianos+four+strings&hl=en&sa=X&ved=0ahUKEwjKr-TR6obgAhWHxFQKHaK8D94Q6AEILDAB#v=onepage&q=beethoven's%20pianos%20four%20strings&f=false https://books.google.com/books?id=q6oZkreoZtQC&pg=PA57&dq=be... [2] See, for example, https://www.youtube.com/watch?v=QI1viKPG3TI https://www.youtube.com/watch?v=QI1viKPG3TI starting ~18:32 until the end.