They are allowed serial commas at fancy universities.
I think it is a sensible way to convey how different placement of "and" would be spoken.
You're confusing Mr Trumpet with Rees-Mogg, who may be a brazen bell-end, but doesn't play a wind instrument.
For avoidance of doubt, I wasn't intending to suggest that Mr T is a brazen bell-end, though I am aware he owns several.
I would guess it is on your left shoulder.
The come in pairs and Stevo has the other one.
There's quite a big clue, even without the risible whinge.
As I just realised and edited. Obviously no-one will guess without that clue.