What makes this worth the trip is the premise: the sculpture isn't a concert in the traditional sense. It treats the cathedral's acoustic space as an instrument itself, which means the experience is going to be different depending on where you're standing inside the nave. Grace Cathedral is one of the few spaces in SF large enough and old enough to actually justify that kind of spatial audio approach — the stone walls and vaulted ceiling do real work here.

Practical note: parking on Nob Hill is a genuine headache. Cable car from Powell is the move, or walk up from the Hyde Street cable car line if you're coming from the Tenderloin side. The cathedral can get cold even in summer — bring a layer.

If you only have two hours: arrive a few minutes early, find a seat near the crossing under the central tower, and stay through the full piece rather than drifting. The spatial effect only lands if you're stationary.