According to the Internet source given below, Jay [James Martin] Roberts was an American virtuoso pianist and composer of rags born in Oakland, California. His best known and most widely admired composition is The Entertainer's Rag
(not to be confused with Scott Joplin
's The Entertainer (1902)
) which was expressly written in 1910 to be performed in cutting contests. Considered to be amongst the best pianists of his day he performed widely in America. A figure of doubtful reputation, he was arrested on drug charges in 1916 and subsequently lead a vagabond existence eventually committing suicide in Panama.