Jelly Roll Morton was an American jazz pianist and composer who was a major figure in the development of early jazz music. His genre of music is characterized by two crossword solutions: ragtime (7 letters) and hotjazz (7 letters). Ragtime is a musical style that originated in the late 19th century and is characterized by syncopated rhythms and a steady bass line. Hotjazz, also known as New Orleans jazz, is a style of jazz that developed in the early 20th century and is characterized by improvisation and collective ensemble playing.