Red Velvet is a South Korean girl group formed and managed by SM Entertainment. They debuted on August 1, 2014 with the digital single "Happiness" with the four-member line-up of Irene, Seulgi, Wendy and Joy. Yeri joined the group in March 2015, following their first major release, Ice Cream Cake. Musically, the work of Red Velvet reflects their own group name: their predominantly-pop "red" side experiments occasionally with electronic, funk and hip hop, while their "velvet" side focuses on '90s-influenced R&B with elements of ballad and jazz.The group's Korean-language discography includes two studio albums, one reissue album, one compilation and nine extended playseleven of which topped South Korea's Gaon Album Chart. Hit singles "Red Flavor" and "Power Up" charted at number one on the Gaon Digital Chart; with other singles charting in the top five, including "Happiness", "Ice Cream Cake", "Dumb Dumb", "Russian Roulette", "Rookie", "Peek-a-Boo", "Bad Boy" and "Psycho". The group ventured into the Japanese music scene with the extended plays #Cookie Jar and Sappy.