'Rather, the work bears the name of Keyserling’s resident harpsichordist, the 14-year-old Johann Gottlieb Goldberg, whose equally sleepless nights were spent playing the variations for his master from an adjoining room.'

https://www.theguardian.com/music/2023/oct/06/vikingur-olafsson-pianist-on-bach-goldberg-variations?ref=thebrowser.com