Martin was a jazz pianist.
...
Then came the London Symphony.
I don't think that any of four kids from Liverpool would speak up one day and say, "You know what would make this? - A Baroque Concert Piccolo Trumpet Descant!"
And who WROTE that part in Penny Lane that the London Symphony trumpet player played?
Great Arrangements don't just happen by themselves.
--Mac
I believe I can answer this definitively, at least to my satisfaction.
Within the last year, I saw this very subject (the creation of the piccolo trumpet part in "Penny Lane") addressed in a documentary.
I can't remember the exact subject of the documentary (George Martin, Paul McCartney, or the Beatles), nor the source of the documentary (it was likely British and shown on PBS).
But I remember the revelation very clearly.
I consider the source in this instance impeccable.
Paul McCartney, in the recording studio, told Martin he wanted the piccolo trumpet. To my recollection, Paul did not know the official name. He called it something like "a high trumpet" or a "high horn".
George knew what he was referring to.
According to the source, Paul told George Martin the exact notes he wanted for the horn break. I cannot remember if the source said Paul whistled or sang "da da da" to convey the notes and the rhythm.
George wrote the part down. He told Paul there was a problem. A couple of notes were above the range of the piccolo trumpet.
Paul was crushed, as those were the notes. George said maybe all was not lost, that the best symphony players could sometimes exceed the standard range of an instrument by a bit, and said that they would just have to try it.
It was played beautifully, without a problem. The notes played were the exact notes conveyed to George Martin by Paul McCartney. (No improvisation.)
So George Martin was
1. not the composer of the piccolo trumpet part
2. not the arranger of the piccolo trumpet part
according to this source, who told this story directly to the camera.
I said previously that I considered the source impeccable in this instance.
2 reasons:
1. The source was there when this transpired.
2. The source had nothing to gain by lying (and something to lose).
The source was George Martin.
So in the instance of this "Great Arrangement", the composer and the arranger of the "Penny Lane" recording was indeed one of the "four kids from Liverpool", Paul McCartney.
I do not believe that the documentary was fabricated by the British Empire using CGI or that George Martin was paid off in the interest of revisionist history.
The whole assertion of the British Empire driving the Beatles is INANE!
EVERYBODY who knows,
KNOWS that the Beatles were a cold war creation of the KGB!
P.S. Not that well known: One must be very wealthy to be Knighted. It is very expensive, and those titles provide quite a revenue stream.
(As in "You can be in our club! It's a great honor! But you must pay your dues." ((The "dues" here are NOT the toil made to be worthy of club inclusion.))