This must be the easiest way to set up a wireless speaker system in your rooms. Just take a bulb, screw into an existing lamp or light fixture, and pair with your phone, voila!  Designed by Sengled Pulse.

Turn it on, and turn it up! Sengled Pulse speakers house the high-quality audio of a JBL Bluetooth speaker in an energy-efficient, dimmable LED lightbulb. Simply twist into any standard light socket and immediately enjoy rich stereo sound. Sync and control settings with the app.

Up to eight speakers can be connected for a full house experience. Dancing is encouraged! $149.