Seoul, Dec 4 : K-pop superband BTS has topped nine of Billboard's year-end charts for 2021, including the year's top duo/group category. Yonhap News Agency quotes Billboard as saying that BTS ranked No. 1 on the lists of Top Artists - Duo/Group, Hot 100 Artists - Duo/Group, Billboard 200 Artists - Duo/Group, Billboard Global Excl. U.S. Artists, Digital Song Sales Artists and World Albums Artists. The band's 2020 hit song 'Dynamite' led the year-end Billboard Global Excl. U.S. chart, while 'Butter' stood atop the Digital Song Sales list. Its fifth studio album 'BE' took the No. 1 title on the top World Albums for 2021. "BTS dominates internationally," said Billboard in a posting on its website. "The seven-piece South Korean group is the year's top artist, and has the year's top song, on the Billboard Global Excl. U.S. recaps." BTS has gone big in 2021, having three Billboard Hot 100 chart-toppers under its belt -- 'Butter', 'Permission to Dance' and 'My Universe', a collaborative effort with British rock band Coldplay. /IANS