K-pop supergroup BTS said Tuesday it was deeply honored to top the U.S. Billboard charts with its new album, "Arirang," adding it hoped the album and its lead track, "Swim," provided listeners around the world with "courage and comfort." Billboard said in a preview of this week's Hot 100 main singles chart that "Swim" became the band's seventh No. 1 song on the chart, following the album's debut at No. 1 on the Billboard 200 chart. The dual triumph marks BTS' first simultaneous No. 1s on both ch