The organ pipes were growing out of the floor

I'm in a church with no ceiling, just open sky, and the pipes are coming up out of the floor like cattails. The wind makes them hum, not in tune, but I don't try to fix it — I just stand there listening, and the reeds are wet with dew. Somewhere a congregation is singing a hymn I half-know, but the sound is coming from underneath the ground, like the whole building is breathing.