Conversation so far:
Who is the best-known composer of ragtime music
Scott Joplin achieved fame for his ragtime compositions and was dubbed the King of Ragtime.
When was Scott Joplin born?
Scott Joplin was born in Linden, Texas, either in late 1867 or early 1868.
What are Scott Joplin's singature songs?
One of Scott Joplin's most popular pieces, the Maple Leaf Rag, became ragtime's first and most influential hit, and has been recognized as the archetypal rag.
Did Scott Joplin win awards for his music?
In 1976, Scott Joplin was posthumously awarded a Pulitzer Prize.

Question: what are the categories of the prize
Self-contained rewrite: What are the categories to be awarded a Pulitzer Prize?