Coming across a post in Maria Popova's blog, I recalled a Fresh Air interview years ago with then bandleader and trumpet player on Johnny Carson's The Tonight Show, Doc Severinsen. When host Terry Gross asked him about the source of his inspiration he became uncomfortable and deflected the question.
When she pressed him, he expressed reluctance and gave an ambiguous explanation that revealed that not only was he somewhat superstitious about dissecting the source of his talent, but also not sure if he had an answer.
Popova's post in her eclectic Brain Pickings blog contained this telling excerpt:
...Polish poet Wisława Szymborska considers why artists are so reluctant to answer questions about what inspiration is and where it comes from:
"It’s not that they’ve never known the blessing of this inner impulse. It’s just not easy to explain something to someone else that you don’t understand yourself."