The term Joplin Tune is a reference to the musical style of Scott Joplin, an American composer and pianist from the late 19th and early 20th centuries. The crossword solution for this term is RAG, which is a type of music that was popularized by Joplin. Ragtime is characterized by syncopated rhythms and a fast tempo, and it often features improvisation. Joplin's compositions are some of the most famous examples of ragtime music.