not strictly related to trumpet -but to any instrument I play
For example, yesterday I had a music im my head "when I need you" and I sat behind piano and I instantly picked it up C, bB , A , G, G, A , bB, bB etc etc and underlying harmony as well C7, Fmaj7, E dim etc etc...
but for instance when I tried to pick up "I'd rather go blind" than I hit problems
Why are some scores so easy to pick and some so difficult?
Also do you use some special technique -like intervals or such?