84 さんの買ったCDのライナーノーツにも書かれているけれど、既に病状が悪化していた頃、ゴルトベルクに関してこんなエピソードがあります。

以下、'Rudolf Serkin : a life' (評伝) より引用

When he was no longer able to speak, his fingers, moving on the bed, showed that he was still working the piano in his head.
Peter: "You could see he was playing the Goldberg Variations. I just sat, quiet, and watched him play. ..."