My high school choir performed the Hallelujah Chorus once, which means it’s one of the few pieces of music I understand. (It also makes it more fun to sing along).
Three texts from Revelation comprise the libretto. “For the Lord God omnipotent reigneth.” At first all the voices sing this in unison. Then they begin to call it out to each other, interspersing it with joyful “Hallelujahs.”
Next, in four-part chorus, the voices exult that “The kingdom of this world is become the kingdom of our Lord, and of his Christ.”
Finally, the singers jubilantly announce that “He shall reign forever and ever,” again interspersing this with “Hallelujahs,” until the “forever and ever” and “Hallelujah! Hallelujah!” assume the same rhythm, and begin to rise higher and higher, gathering in both pitch and intensity.
There follows the silence of probably the most famous and effective caesura known to music before the great, swelling resolution of the final “Hallelujah!”
Legend has it that Handel experienced a vision of heaven while composing the famous chorus. I’m not pushing that story, necessarily, but I can well believe it. Because there I was straining my vocal chords beyond my alto capacity when, right in the middle of the Cabin John Bridge, I was suddenly swept up in the music and imagined all those voices as the great company of saints, praising God, both singly and together.