He is a maestro with a lot of creativity - no questions about it.
Lot of music flowed from "inside" and were his own "inventions" - not disputed.
However, like any human artist, he had drawn his inspirations from many sources and got influenced as well. At different levels and degrees during his "30+ years-and-still-running-strong" career.
Let's discuss what his inspirations / influences were / are and how it affected his music.