Then it was used in a series of baseball articles in the San Francisco Bulletin starting in March 1913.
Getting back to the verified occurrences in 1912, the word “jazz” appeared again in the L.A. Times on April 3. Then it was used in a series of baseball articles in the San Francisco Bulletin starting in March 1913. (Dr. Cohen explains that, despite the isolated L.A. occurrences, the word comes from San Francisco.) It's clear that the word was new, because the sports writer in San Francisco, “Scoop” Gleeson, felt that he needed to add, on March 6, 1913, this explanation: