As for Jazz music. While yes, it was born in New Orleans. It's origins have nothing to do with Congo Square other being in the same city.
@IllmaticDelta rippin this from you, breh.
So, what was unique about New Orleans that lead to the birth of Jazz?
Answer:
Brass marching bands
African-Americans have been playing in marching bands since the 18th century. They became a common for AAs to raise money for benevolent/social aid/pleasure societies and black colleges(drumline anyone?).
New Orleans had the most AA benevolent societies in the south during the post reconstruction era. And when the brass marching band movement began it hit hardest in New Orleans, when it's leader, Patrick S. Gilmore, performed his “Grand National Concert” in New Orleans, on March 4, 1864.
These brass bands became a way for black New Orleanians to raise money for their benevolent societies. The oldest African-American benevolent society in New Orleans, Young Men’s Olympian Jr, still to this day host annual second line parades.
It's when you combine the high amount of brass bands, with folk ragtime, and blues(as well as black church spirituals) music that set New Orleans apart as a breeding ground for the evolution of Jazz music. It has nothing to do with Congo square or some mythical caribbean influence. Budden bolden said to be the father of Jazz was a bluesman that played in a brass band, himself.
And of course second lining and 'jazz funerals'(which actually predate jazz) come from this brass band tradition as well.
For instance NYC and any other city where AA military personal were stationed also had the ingredients for jazz music also stationed also. Which is why James Resee Europe and his "Harlem Hellfighters" corps also produced music that a lot of scholars have trouble classifying because it's very "Jazz like" but is contemporary or predates the earliest "dixie land" ensembles in New Orleans. In a similar way as you had the Watts Prophets and Pigmeat Markham producing music that was very "Hip Hop like", that predate or was contemporary to the birth of Hip Hop in the Bronx, NY, but lacked certain aspects such as the djing style. As it was the large among of "ghetto" outdoors disco djs that made NYC a unique breeding ground for Hip Hop, not any Jamaican influence.
Blues, Ragtime, and Spirituals were already ubiquitous in AA musical culture at that point. The only thing that set NO apart was it's the high amount of brass band ensembles. But, large congregations of AA military persons also had all of these traits as well
James Reese Europe's Proto-Jazz
Harlem's James Reese Europe Invented Jazz, 1881 – 1919
So, again
improvised folk rag, blues, spirituals, and march/brass bands = Jazz
What about the Cuban influence?
A complete misnomer. The rhythm that people often ascribe to in Jazz as being of Cuban origin is actually of Central African origin and a motif used across various African-American genres, folk songs, and dances all across the US, not just new orleans. Afr'Ams know it as the hambone, while Cubans know it as the Habenera, and use it as the foundation of basically all of their music, while Afr'Ams only use it as a decorative motif in most genres for the most part. The person, Jelly Roll Morton, who's quote they use to link it with Cuba didn't even make the connection himself and simply called it the "spanish tinge", again, because of it's common use in Latino music, not nesessarily citing "spanish" music as an origin.. Most other early AA musicians like Bo diddley, Red Saunders, and James P Johnson attest that they heard it from various African American folk songs and dances.
But, people are so desperate to draw a connection between Jazz and the Caribbean they come up with shyt like this:
- Mississippi artist like Bo diddley were known for playing the hambone rhythm
- AAs all the way in south carolina have folk songs and dances using the same rhythm
- Buddy Bolden the non-creole protestant bluesman who played in a brass marching band who's credited for developing jazz music in New Orleans played songs on the rhythm as well
- Creole exoticist logic: The rhythm must come from the Cuban habenera(cuban name for the hambone) to new orleans congo square and then to jazz music.