From vibrant dance-pop songs like "Red" to more lush R&B-tinged tracks like "Velvet," the five women of Red Velvet -- Irene, Seulgi, Wendy, Joy and Yeri -- have spread joy and happiness throughout the K-pop world since 2014. They are among one of the best-charting K-pop acts in the U.S., with the most No. 1s on the Billboard World Album chart from any South Korea-based female act. (Billboard)