BTS' 'ARIRANG' debuted at No. 1 on the Billboard 200 in 2026 with 641,000 units, including 532,000 pure sales, marking the biggest album debut of 2026 and for a K-Pop album in US history. Taylor Swift's 'Folklore' debuted at No. 1 in 2020 with 846,000 units, having the biggest sales week that year. Adele's '25' sold 3.38 million copies in its first week in 2015, setting a modern record for first-week album sales.