* 関連リンク

-https://variety.com/2021/music/news/music-curators-pick-best-songs-bts-butter-1235127795/

-https://www.rollingstone.com/music/music-lists/50-best-songs-of-2021-list-1260934/bts-butter-1260965/

-https://www.nme.com/features/music-features/nme-best-songs-of-the-year-2021-3112636

-https://www.esquire.com/entertainment/music/g36135549/best-songs-2021/