Some other Joplin facts may be of interest. "Maple Leaf Rag" was quite popular in the early 20th century. It is frequently claimed to be the first piece of sheet music to sell over a million copies.
ragtime like music is much older. i remember that even "classical" pianist louis m. gottschalk wrote ragtime concert pieces. i believe he got the idea for this rythm fromhis extended travels to cuba and central america. he died in 1869, two years afterscott joplin was born. as he was a contemporary of chopin, i bet that chopin and liszt knew his music. whythey didn't take it up ... don't know. maybe l.m.g. was before his time i also know ragtimes from eric satie and even heard that prokofiev played them (atleast for fun as i have never discovered any scores).