"the opening notes of a Scott Joplin rag"
(c. 1867-1917) was an American composer known for his Ragtime compositions. Ragtime is a form of music which blends European and African-American styles of melody and rhythm. Joplin's first hit, the 'Maple Leaf Rag', had an enormous influence on the development of this genre.
Listen to Joplin's Maple Leaf Rag on Spotify.