“First published in 1741, J.S. Bach’s Goldberg Variations is often considered the most ambitious composition ever written for harpsichord. ”
Here’s the story. This material was released under the Creative Commons Zero License which puts them in the public domain. How nice.
Beautiful music. Written for harpsicord and performed, in this instance, on piano.
Bonus: Read through the first link to find where to download all of Bach’s organ music.