Billie & Lillie were an American pop vocal duo, consisting of Billie Ford and Lillie Bryant, active during the late 1950s and early 1960s. They are primarily known for their hit single "La Dee Dah" which reached number 9 on the Billboard Hot 100 chart in 1958. Their music was characterized by a blend of doo-wop, early rock and roll, and pop sensibilities, reflecting the transitional period of music at that time. Despite their relatively short career, Billie & Lillie left a notable mark on the late 50s pop scene.