Which musical piece is associated with the composer Scott Joplin, who is famous for Ragtime music?

The musical piece famously associated with Scott Joplin, who is known as a pioneer of Ragtime music, is "The Maple Leaf Rag." This piece, composed in 1899, is one of the most significant examples of the Ragtime genre and solidified Joplin’s reputation as the "King of Ragtime."

"The Entertainer" is also a well-known composition by Joplin and is often associated with him, but it comes after "The Maple Leaf Rag" and is not the primary piece most closely identified with him when discussing the origins and recognition of Ragtime music.

"Rhapsody in Blue" is a different composition entirely, written by George Gershwin, and represents a blend of classical music with jazz influences, showcasing a different genre and historical context. "The Wild Party" is a musical by Andrew Lippa based on a poem by Joseph Moncure March, unrelated to Joplin's work entirely.

Thus, "The Maple Leaf Rag" serves as the quintessential piece representing Scott Joplin's contributions to music and the Ragtime style.