Ryan Tedder — front man of American pop-rock band OneRepublic and a Grammy-winning producer — revealed during the band's Seoul show on Monday that he participated in BTS' upcoming album "Arirang," set for release on March 20. “Most recently, I did a lot of work on the upcoming BTS album,” Tedder said. “It absolutely blew me away how talented they were, and I think it’s honestly one of the craziest things I’ve worked on in my whole career. I know you’re going to love it.” Tedder has written hits