In his Bedouin Hornbook, Nate Mackey quotes this chunk from a book entitled Sound and Symbol by Viktor Zuckerkandl (it's in Duke library but not Durham public):

The dynamic quality of a tone is a statement of its incompleteness, its will to completion. To hear a tone as dynamic quality, as a direction, a pointing, means hearing at the same time beyond it, beyond it in the direction of its will, and going toward the expected next tone. Listening to music, we are not first in one tone, then in the next, and so forth. We are always between the tones, on the way from tone to tone; our hearing does not remain with the tone, it reaches through it and beyond it.