I did some searching/Googling, and only found out who the actual trumpet players were on the recording.
However, I can't figure out if the background trumpet fanfares were recorded in real time . . . . . or done via the Beatles' often-used half-speed recording / full-speed playback technique. (i.e., recording at half-speed an octave lower than written; resulting in normal pitch playing back twice as fast at the analog recorder's full-speed).
The trumpets are very articulately flying through what sounds like 32nd notes at about 160bpm during the fanfare!!
Anybody have any background info on how those particular trumpets were recorded??