Scott Joplin was an American composer and pianist who is widely regarded as one of the most influential figures in the development of ragtime music. His works, such as 'The Entertainer' and 'Maple Leaf Rag', are some of the most iconic pieces of ragtime music. The term 'RAGS' is used to refer to a style of piano music that combines elements of classical music with African-American folk music. Joplin's works are considered to be some of the most important examples of this genre.