You'll always know the reason why
The song you heard, will stay on your mind
It ain't gon' let you go, no
Cuz you are the moon and I the endless sky

from Sade (Ft. Jay Z) – The Moon and the Sky (Remix) Lyrics on Rap Genius

Meaning

Sade and her former lover will never be able to escape each other because their fates are intertwined like the moon and the sky’s.

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