Looking into piano rolls at work today and it's a fascinating technology that provided music at a time when Edison's low-fidelity phonograph was the only other alternative to hiring a musician.
I've never seen one in use, so it seems incredible that piano rolls were in continuous production from 1896 to 2008. I'm familiar with their design though, which can still be seen in the layout of MIDI editing on most digital audio
I was surprised to learn on Wikipedia that performances by many great pianists and
composers were recorded using piano roll, including Gustav Mahler,
Camille Saint-Saëns, Edvard Grieg, Claude Debussy, Sergei Rachmaninoff,
Sergei Prokofiev, Alexander Nikolayevich Scriabin, Jelly Roll Morton and
Double dare toasted sandwich - My 20th remarkable sandwich!