BTS' chart-topping smash hit "Swim" has been accused of plagiarizing an unpublished demo track by little-known U.S. songwriters, with the group's label, BigHit Music, dismissing the claim as "one-sided" and pledging a strong legal response. Three songwriters — Steve Cooper, John Sandler and Greylyn Johnson — filed a lawsuit in the United States on Wednesday (U.S. time), alleging that "Swim," the lead track of BTS' fifth album, "Arirang," bears "substantial similarities" to their own song of the same name, Billboard reported the following day. According to the report, the plaintiffs named Hybe, Hybe America and BigHit Music as defendants, along with the song's credited writers, including former OneRepublic member Ryan Tedder. Neither BTS nor its members were listed as defendants, although RM is credited as one of the songwriters on the track. Hybe is the parent company of BigHit Music, while Hybe America is the American unit of Hybe. The plaintiffs argue that, beginning in March last year, they circulated their demo to multiple music industry contacts, including executives at Artist P