That single note after the tenor solo had me listening to it several times as I was trying to decide whether what I was hearing was in fact on muted trombone and not Hubbard’s first note on trumpet. It’s a very low note, and while it would still be in the extreme lower range of the trumpet and possible for a great instrumentalist like Hubbard, it is unusual to have a player "hand-off" a solo to another player that way. But, given the highly interactive nature of this music it’s not out of the realm of possibility. However, final verdict (for me):
It is a single note on trombone. Listen to the vibrato at the end of that note and right before Hubbard plays his first note on trumpet. That is what is called "slide vibrato"; made by quickly moving the slide back and forth a very short distance. Not possible on trumpet since there is no slide on the trumpet and on which "lip vibrato" is used. However....why did he play that single note? My previous possible answer sounded interesting (I think), but I have to take it back. Notice Moncur solos following Hubbard at 8:43. I think he simply screwed up and started soloing after Shorter instead of waiting until Hubbard had soloed. He then realized his mistake (or was waved out) and stopped. Being the great musicians that they are, they made it all sound musical. All this goes to your question re how "scripted" it all was. In a studio situation with a finite amount of time ($) there are definite guidelines re order of solos and length of solos. To make it all sound free and unscripted is part of the art of it all. This sort of thing happens and happened a lot more often than one might think. Today in our age of easy digital editing, multi-tracking and quest for error-free performances, the producer may have simply taken that note out; a big mistake, imo.
It is a single note on trombone. Listen to the vibrato at the end of that note and right before Hubbard plays his first note on trumpet. That is what is called "slide vibrato"; made by quickly moving the slide back and forth a very short distance. Not possible on trumpet since there is no slide on the trumpet and on which "lip vibrato" is used. However....why did he play that single note? My previous possible answer sounded interesting (I think), but I have to take it back. Notice Moncur solos following Hubbard at 8:43. I think he simply screwed up and started soloing after Shorter instead of waiting until Hubbard had soloed. He then realized his mistake (or was waved out) and stopped. Being the great musicians that they are, they made it all sound musical. All this goes to your question re how "scripted" it all was. In a studio situation with a finite amount of time ($) there are definite guidelines re order of solos and length of solos. To make it all sound free and unscripted is part of the art of it all. This sort of thing happens and happened a lot more often than one might think. Today in our age of easy digital editing, multi-tracking and quest for error-free performances, the producer may have simply taken that note out; a big mistake, imo.