Mr. Domino is a famous American singer, songwriter, and pianist who was born in 1928. He is best known for his work in the genres of rhythm and blues, soul, and rock and roll. His most popular songs include 'Ain't That a Shame', 'Blueberry Hill', and 'I'm Walkin''. The term FATS, which is a 4 letter crossword solution for Mr. Domino, stands for 'Fats' Antoine Domino Jr., which is his full name.