The Standing Room blogs about the San Francisco performance of Phil Kline's Unsilent Night:
Kline's description of a cloud of sound is apt: the harmonies are by necessity pretty static and the pulsations change depending on who you happen to be standing near. But the transitions between sections are wondrous, as each machine moves on to a new chord or introduces a different texture at its own pace and in its own place. Listen, a voice! Where are those chimes? Are those sleigh bells up ahead? Or are they behind?
Anne Midgette in the New York Times describes the concept:
People show up at a specified meeting place with a boombox that can play cassettes. Mr. Kline prepares tapes in advance and distributes them. He has everyone start them at the same time, and then leads a parade of sound through the streets, droning and chiming and caroling.
I was planning to participate last year but something came up at the last minute; this year, it escaped my notice...