In New York City you’ll see this scene every once in a while. When a subway performer is really good, or playing some familiar songs which connect with people, they’ll just start dancing.
Only in NYC, where waiting for a train can turn into an all night dance party.
There was a group I used to see underground at Penn Station, on my way to catch the train. They always had a dancing crowd around them as they played Michael Jackson, Stevie Wonder, and other classic artists.