William Clarence Eckstine was an American jazz and pop singer, and a bandleader of the swing era. He was noted for his rich, resonant, almost operatic bass-baritone voice. Eckstine's recording of "I Apologize" (MGM, 1948) was awarded the Grammy Hall of Fame Award in 1999. The New York Times described him as an "influential band leader" whose "suave bass-baritone" and "full-throated, sugary approach to popular songs inspired singers like Joe Williams, Arthur Prysock and Lou Rawls."
