It was a music more tangible than form or sight.  It had essence and structure. . . . It seemed to travel with her [Meg], to sweep her aloft in the power of song, so that she was moving in glory among the stars, and for a moment she, too, felt the words Darkness and Light had no meaning, and only this melody was real.

-- Madeleine L'Engle
(from A Wrinkle in Time)