At the end of Canto Four of his poem John Shade (the poet in VN's poem Pale Fire, 1962) says that the day (the last day of Shade's life) has passed in a sustained low hum of harmony:
Gently the day has passed in a sustained
Low hum of harmony. The brain is drained
And a brown ament, and the noun I meant
To use but did not, dry on the cement.
Maybe my sensual love for the consonne
D'appui, Echo's fey child, is based upon
A feeling of fantastically planned,