music

For centuries, poets, lovers, and mystics have been praising one form or another of music as eternal. These paeans were premature since sound lasts only a few seconds. But when the first radio wave music escaped Earth's ionosphere, it literally did become eternal. As it filtered out through Earth's atmosphere, light began a journey into the places between the stars. Music... has been converted from sound into the clarity of pure light.

-- Leonard Shlain Art & Physics