MAMAMOO (Hangul: 마마무) is a four-member South Korean girl group under RBW. The group consists of Solar (솔라), Moon Byul (문별), Whee In (휘인), and Hwasa (화사). Known for their strong live vocals, harmonies, and writing much of their material, they are recognized as one of the premier girl groups in K-pop. They are highly regarded in the industry for their talent and ability to cross multiple genres with their music from retro, jazz, and R&B concepts in their early years to more contemporary hip-hop, as well as emotional ballads.