This answer is formatted poorly, and has an overabundance of CAPITALS, but it seems like a legitimate answer, even if it's not the most helpful one. I would suggest it should be edited and improved rather than deleted:
https://musicfans.stackexchange.com/a/9930/92
MANY SLAVES WERE ALLOWED TO BRING THEIR MUSICAL.INSTRUMENTS THAT.PLAYED THEM.ON THE SLAVE SHIPS THE STINKING SLAVE HOLDERS FIGURED OUT THST IF A SLAVE PLAYED MUSIC AND SANG THEY WPULD BE MORE PRODUCTIVE, IN WHAT WORK THEY WERE DOING, JAZZ CAME FROM BLUES..BLUES HAD A BABY THEY CALLED IT ROVK AND ROLL, JAZZ CAME BEFORE R AND R LONG TIME BEFORE, GERMAN BANDS SAT IN WITH X SLAVES IN.NEW yourk HARLEM.MIXED BLUES AND CLASSICAL.together to get a new sound in the 50s thats when Harlem roenaissance I married a Delta blues arkansas blues legand and this is more truth.