The last thing I noticed when I listened to Days of Future Passed is in "Cities," the B-side of the "Nights in White Satin" single, included as a bonus track.
In the chorus, the line "In the sky" is sung entirely to F# notes, and "On the ground" (the next line) is sung entirely to D notes. Musically, there's a sense of the relative positions of "the sky" and "the ground" through these pitches: "the sky" (F#) is above "the ground" (D).
