At least a few months ago, there was an analog channel 6 in New York City, which may really been an excuse to establish an FM radio station just below the FM radio broadcast band in that solidly packed FM dial. Most FM sets will tune 87.75MHz, which is where you could find the analog TV channel 6 sound carrier. One could put a TV camera looking at the DJ in the studio, as an excuse for video programming, and have the sound carrier play the music the DJ was spinning. "Oh, you mean that FM radios can listen to us without seeing the DJ?"
In smaller markets, you could find an empty FM frequency, or just buy an existing FM station, to get on the air. NYC stations go for a lot of money. Oddly enough, NYC FM stations are mostly lower power, but they probably have more listeners per watt of RF power than anywhere else in the USA. Like 100mW per listener.