The Mills Brothers were an American vocal group formed in 1928, known for their smooth harmonies and unique sound. The group originally consisted of four brothers: John Mills, Herman Mills, Donald Mills, and Raymond Mills. They gained popularity in the 1930s and 1940s, recording numerous hits and becoming a staple in the jazz and pop music scenes. Their style blended elements of jazz, pop, and traditional American music, often featuring intricate vocal arrangements and a cappella performances. The Mills Brothers are best remembered for songs like "Paper Doll" and "You Always Hurt the One You Love," leaving a lasting impact on the music industry.