Larry Williams and Johnny Watson were an influential American blues and rhythm and blues duo active in the mid-20th century. Known for their energetic performances and fusion of various musical styles, they made a significant impact on the development of rock and roll. Williams, a singer, songwriter, and pianist, and Watson, a multi-instrumentalist, were particularly known for their collaborations on hits like "Mercy, Mercy, Mercy". Their music has been covered by numerous artists, demonstrating their lasting influence on the music industry.