From NKAA, Notable Kentucky African Americans Database (main entry)
McClain, William C. "Billy"(born: 1857 - died: 1950) Multi-talented William C. McClain was a minstrel actor and Hollywood motion pictures actor, he was also a dancer, a musician, a playwright, he wrote music and lyrics, and was a short story writer. He played cornet in Lou Johnson's Minstrels, and spent many years with the minstrels in Europe and lived in Paris, France from 1906-1913. He was also a member of Orpheus McAdoo's Jubilee Singers and Concert Company in Australia. One of McClain's works was The Smart Set, written in 1901. He wrote several songs including Shake, Rattle, and Roll. McClain had also trained as a boxer, and he managed and trained famous heavyweight boxer Sam McVey.
On the screen, McClain played the role of The King in Nagana in 1933, and appeared in more than 20 movies, the last in 1946. He played various restricted roles, such as a servant, butler, footman, cook, and janitor. In 1938, he played the uncredited role of Zeke in Kentucky, and in 1939, the role of a horse groomer in Pride of the Bluegrass [aka Steeplechase].
William C. McClain was the husband of Cordelia McClain, and the father of actress Teddy Peters. At the time of his death, his age was estimated to be 93, but his birth year has also been given as 1866, and his birth location has been given as Kentucky and Indianapolis, IN. William C. McClain died in Los Angeles, CA, on January 28, 1950.
For more see "Arrangements incomplete for actor's rites," Los Angeles Sentinel, 02/02/1950, p.A4; "Billy McClain" in Who Was Who On Screen, by E. M. Truitt; A History of African American Theater by E. Hill and J. V. Hatch; and The Ghost Walks by H. T. Sampson.