A block party is a large public celebration in which many members of a single neighborhoo congregate, either to observe an event of some importance or simply for mutual enjoyment. The name comes from the form of the party, which often involves closing an entire city block to vehicle traffic. Many times, there will be a celebration in the form of playing music and dance. Block parties gained popularity in the United States during the 1970s. Block parties were often held outdoors and power for the DJ's sound system was taken illegally from street lights. This was famously referenced in the song "South Bronx" by KRS-One with the line: