Dooley Wilson
Arthur Dooley Wilson was an American actor and singer, who is best remembered as the pianoplayer and singer Sam who sings As Time Goes By at the request of Ilsa Lund in Casablanca .
Arthur Wilson was born in Tyler, Texas, and broke into show business at the age of 12, playing in a vaudeville minstrel show. He sang and played the drums in black clubs in the Tyler area before he moved to Chicago. He received the nickname Dooley while working in the Pekin Theatre in Chicago, circa 1908, because of his thensignature Irish song Mr. Dooley, which he performed in whiteface. He worked in black theatre in Chicago and New York for most of the period from 1908 to the 1930s, although in the 1920s he toured Europe as a drummer and singer in his own band, the Red Devils.
Source: Wikipedia