Bach Goldberg Variations (Gould, 1981)

Magnificent sonofabitch. 

"Gould was widely known for his unusual habits. He usually hummed while he played the piano, and his recording engineers had mixed results in how successfully they could exclude his voice from recordings. Gould claimed that his singing was unconscious and increased proportionately with the inability of the piano in question to realize the music as he intended. It is likely that this habit originated in Gould's having been taught by his mother to "sing everything that he played", as Kevin Bazzana puts it. "This became "an unbreakable (and notorious) habit". Vía Wondrous Strange: The Life and Art of Glenn Gould (2003).

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