Horizon
If you stood outside right now and looked up — this is the sky over you, and what it's singing. Sun, Moon and the five naked-eye planets at their true altitude and azimuth, each a sustained just-intoned voice. Above the horizon they sound; below it, silence.
time · — now
using default location (SF) — allow location for your skyleave it — the sky turns on its own after a few seconds
what's up right now
Pitch is fixed by each body's real orbital period (faster = higher), snapped to just intonation — low-precision astronomy meant for singing, not navigation.