The Mills Brothers were an American vocal quartet from Piqua, Ohio, whose smooth harmonies and innovative vocal arrangements helped shape popular music in the 20th century. Active from the 1920s through the 1980s, they were among the first African American groups to gain widespread crossover success. Renowned for mimicking instruments with their voices, they blended jazz, swing, and pop with remarkable ease. With timeless hits like “Paper Doll” and “Glow Worm,” the Mills Brothers influenced generations of performers and remain icons of vocal artistry and American musical heritage.