I've heard Mr. Alpert describe that he and the musicians who appeared on the TJB recordings never quite knew how the arrangements would turn out when they arrived at the studio for a session. And yet, I did see a specific, carefully written-out chart of the trumpet parts for "A Lonely Bull" in a website photograph showing the UCLA exhibit of A&M Records memorabilia. Perhaps the sessions were charted out to a certain extent, and then, when all the creative artists were with Mr. Alpert in the studio, they all contributed additional ideas, which Mr. A. had complete control over. Any insights here?