If you've ever worked backstage at an event, you know: timing matters. But what happens when sound, light, and interaction all need to synchronize? One missed cue and your symphony of sound and light becomes chaos. In this talk, we'll explore how React 19 and XState can orchestrate live cues across web APIs and AI-generated music, syncing it all with lighting. Pair this with the right hardware, and your room can come to life right on cue.