This is a very interesting project called Cory Arcangel, I leave to explain the whole work by the creator:

“Recently I took a few months of my free time and decided to recreate Arnold Schoenberg’s 1909 op. 11 Drei Klavierstücke (aka Three Piano Pieces) by editing together videos of cats playing pianos downloaded from Youtube. Schoenberg’s Op11 is often considered the first piece of “atonal” music, or music to completely break from traditional western harmony which means it’s not written in a “key”. Below you will find the three videos (one for each piano piece), a technical description & the score. This project fuses a few different things I have been interested in lately, mainly “cats”, copy & paste net junk, and youtube’s tendency in the past few years to host videos that are as good and many times similar to my favorite video artworks“.

For more infos, go here.