I once saw my mother playing Mary Magdalene in a parish event. But she had to put the role aside in order to go and front the choir who were singing at the same occasion. She left the stage halfway through the Crucifixion. ↗
It is all about being open and paying attention to the music in your head. I think most people have original music playing in their heads from time to time. ↗
Teddy Wilson, I think, said a little while ago that it's much easier to come in and play whatever comes into your mind, without obeying any of the laws of bass line and harmony and so on. ↗