Jim bought Paul his first instrument for his fourteenth birthday. It was intended to help distract him after the recent death of his mother.
The trumpet was accompanied by some lessons - which Paul was unkeen on continuing. It seems they introduced him to at least some basic musical theory
I persevered with the trumpet for a while. I learnt ‘The Saints’, which I can still play in C. I learnt my C scale, and a couple of things.
Though Paul ‘loved’ trumpet, there were practical problems.
...I realised that I wasn’t going to be able to sing with this thing stuck in my mouth, so I asked my dad if he’d mind if I swapped it for a guitar, which also fascinated me. He didn’t, and I traded my trumpet in for an acoustic guitar, a Zenith, which I still have.