The Kelly Bros. Singers were a highly influential American gospel and soul group active in the 1950s and 1960s. Comprising of brothers Andrew, Curtis, Robert, and T.C. Kelly, their music fused traditional gospel harmonies with contemporary R&B and soul sensibilities. They are particularly notable for their 1966 hit single "Hangin' On In" which displayed their signature blend of spiritual and secular themes. Their contributions to the music industry played a significant role in the evolution of gospel music, bridging the gap between the genre's traditional roots and newer styles.