What was Scott Joplin's most famous song?

Given
Joplin's wide range of work and his fame, I think there could be many responses here.  I would
say "The Entertainer" might be his most famous piece.  It symbolized much of the
Ragtime tendencies that became so closely associated with Joplin.  While his music was
prominently featured in Marvin Hamlisch's musical score of the 1973 film, "The Sting,"
most people recognize the opening credits as being composed of Joplin's "The
Entertainer."  The song itself has been called a "two step," indicating its
presence in dance and a fast pace which made it so representative of Joplin's Ragtime
style.