The Shangri-Las were an American girl group from the mid-1960s, most noted for their dramatic, teenage tragedy songs. Consisting of two sets of sisters, Mary and Betty Weiss, and twins Margie and Mary Ann Ganser, the group was known for their emotionally charged ballads and distinctive use of sound effects. Their biggest hit, "Leader of the Pack," showcases their signature sound, combining pop harmonies with elements of rock and roll. The Shangri-Las' influence is significant, with their melodramatic narrative style shaping the future direction of pop music.