Glenn Gould

First, read about the Voyager Golden Record which is fascinating in and of itself.
Glenn Gould was the one of the musicians featured on that, playing a piece of Bach's Well Tempered Clavier. He also recorded the Goldberg Variations as his first recording in 1955, and re-recorded them again in 1981 as one of his last performances. Here is the 1981 performance in it's entirety:



Wiki article about him here, and then put this on your movie queue.