I am an intermediate self-taught pianist(Trinity Grade 5).
I learnt a beautiful arrangement of a GOT song which I found on YouTube. It had really difficult left hand patterns and the arranger seemed to have created them for that particular song only. They fit perfectly to the song and when I tried using them elsewhere, it just doesn't sound right. I hope I am clear.
I want to know how pianists create original arpeggios, get creative and what process goes into creating amazing arrangements and I want to do the same in my own arrangements and pieces. Any help would be appreciated.