"Swim," the lead track from BTS' fifth studio album "Arirang," has slipped one spot to No. 2 on the US Billboard's main singles chart. The upbeat alternative pop track came in behind chart-topper Ella Langley's "Choosin' Texas" on the Billboard Hot 100 for the week of April 11, according to a Billboard preview released Monday (US time). Meanwhile, the 14-track album ruled the Billboard 200 albums chart for two consecutive weeks, making history for a K-pop act to achieve the feat. "Arirang" explo