"From the very first in scoring the music for The Dark Crystal, I set out to find two melodic ideas — one for the Mystics, the other for the Skeksis. These two motifs, when counterpointed, fuse to become one, and in the Great Conjunction at the film’s climax, they join to become the central theme."
January 1, 1970
https://en.wikiquote.org/wiki/The_Dark_Crystal