Fred Coulter
Collector of ancient keyboards
Found an article on Wikipedia which lists the frequencies for the keys of the piano, as well as the open strings for the violin, viola, cello, bass, and guitar. It included the extra bass notes of the Bösendorfer Imperial Grand. But it also included notes above the top of the traditional 88 key piano keyboard. I didn't know anyone made a piano with extra notes on the top. Has anyone heard of such a piano?
https://en.wikipedia.org/wiki/Piano_key_frequencies
https://en.wikipedia.org/wiki/Piano_key_frequencies