Final answer:
Jelly Roll Morton was an American jazz musician and composer who played a vital role in the early development of jazz music. He is known for his significant contributions such as introducing a more orchestrated approach to jazz and composing several jazz standards.
Step-by-step explanation:
Jelly Roll Morton is not mentioned in the references provided, but to answer the student's question: Jelly Roll Morton was an influential American jazz musician, composer, and pianist, credited as a key figure in the development of early jazz music. He claimed to have invented jazz outright, although this is certainly an overstatement, but his contributions to the genre were indeed significant. Morton combined ragtime with other musical styles and introduced a more orchestrated format to jazz, influencing its evolution from improvisational music to written composition.
Morton's contributions include composing several jazz standards, such as 'King Porter Stomp', 'Wolverine Blues', and 'Black Bottom Stomp'. These works have become fundamental to the jazz repertoire. Moreover, his recordings with the Jelly Roll Morton's Red Hot Peppers are considered classics and have greatly impacted musicians that followed.