Jelly Roll Morton

Also known as "Jelly Roll LaMothe" (real name Ferdinand Joseph LaMothe) played a lot of rags. However, the key think is that he started swining it, bringing it into the earliest form of real Jazz (Definition) music. There's a lot of audio clips of him claiming to have invented jazz in its own right.

Compare this version of Maple Leaf Rag (actually composed by Scott Joplin, and recorded by Alan Lomax). He plays it very, very quick!

More tunes from him and his band, the Red Hot Peppers (with drummer Dee Dee Chandler):