Warm and cool moment: Robyn fans have a subway sing-along

20- and 30-somethings, filtering out from Robyn's March 8 Madison Square Garden show, ended her concert by screaming her song 'Dancing On My Own' at New York City's subway station. Soon someone pulled out a Bluetooth speaker and everyone started singing her song as if their lives depended on it... Watch the sing-along here.Vulture...