Ferdinand Joseph LaMothe (October 20, 1890 – July 10, 1941), known professionally as Jelly Roll Morton, was an American ragtime and early jazz pianist, bandleader and composer who started his career in New Orleans, Louisiana.

Widely recognized as a pivotal figure in early jazz, Morton is perhaps most notable as jazz's first arranger, proving that a genre rooted in improvisation could retain its essential spirit and characteristics when notated. His composition "Jelly Roll Blues" was the first published jazz composition, in 1915. Morton is also notable for naming and popularizing the "Spanish Tinge" (habanera rhythm and tresillo), and for writing such standards as "King Porter Stomp", "Wolverine Blues", "Black Bottom Stomp", and "I Thought I Heard Buddy Bolden Say", the latter a tribute to New Orleans musicians from the turn of the 19th century to 20th century.