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By 2017, BTS crossed into the international music market, leading the Korean Wave into the United States and breaking numerous sales records, becoming the first Korean group to receive a certification by the Recording Industry Association of America (RIAA) with their single " Mic Drop." The band is the first and only Korean act as of 2019 to top the U.S. Wings became BTS' first album to sell one million copies in South Korea. Billboard 200 entries The Most Beautiful Moment in Life, Part 2 (2015), The Most Beautiful Moment in Life: Young Forever (2016), and Wings(2016) helped establish BTS' reputation as a socially conscious group. The group initially formed as teenagers under Big Hit Entertainment and released their debut single album, 2 Cool 4 Skool (2013). Popular for their live performances, the group has staged several world tours. Their work features references to literature and psychological concepts and includes an alternative universe storyline. Their lyrics, often focused on personal and social commentary, touch on the themes of mental health, troubles of school-age youth, loss, the journey towards loving oneself, and individualism. Initially rooted in hip hop, BTS' musical style has evolved to include a wide range of genres. The septet co-writes and produces much of their output. The name became a backronym for Beyond the Scene in July 2017. BTS (Hangul: 방탄소년단 RR: Bangtan Sonyeondan), also known as the Bangtan Boys, is a seven-member South Korean boy band formed in Seoul in 2013.
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