Repurpose it.
1. Send up multiple geostationary satellites that are stationed around the earth. Point the laser at one of the satellites. It will split the beam and send it to its two neighboring satellites, and then those satellites split the beam and send them to its neighbors for a pair of beams circling (pair of beams for redundancy) the earth.
2. Those source beams will be split again, redirected, and widened to cover major parts of the earth below it. Experiment with different wavelength lasers to see impact of weather, clouds, atmosphere, and use whatever makes it through to the ground.
3. If the downlink laser isn't making it through the clouds, increase power to burn off the clouds.
4. Modulate the uplink laser beam, play music.
5. Profit.