The Delfonics are an American soul music group formed in the 1960s in Philadelphia, Pennsylvania. Known for their smooth harmonies and romantic ballads, they played a significant role in the development of the Philadelphia soul sound. Their most famous hits include "La-La (Means I Love You)" and "Didn't I (Blow Your Mind This Time)," which showcase their distinctive vocal style. The group was originally composed of members William Hart, Wilbert Hart, and Randy Cain. They were influential in the music scene and contributed to the careers of other artists and producers, including Thom Bell, who helped shape their sound. The Delfonics remain a celebrated act in the history of soul music.