I saw The Sting when I was in junior high school. I wasn't too thrilled with the movie, but I absolutely loved the soundtrack. It was my introduction to the ragtime music of Scott Joplin.
The Entertainer and Maple Leaf Rag are two of Joplin's most well-known pieces, but "Easy Winners" is also a favorite of mine. I love the way the different parts seem to dance around one another.
Biography of Scott Joplin here.