Sound clashes have been a mainstay of reggae culture for decades. Mobile sound system teams face off to see who can best move the crowd with their selections of records and exclusive "dub plate" jingles. On a recent late night in Queens, seven sounds competed for the U.S. champion title, and many were surprised by the winner. We meet the sound-system operators and talk to fans about why they love the clash scene. Produced by Noah Schaffer.