Billy Joel is a brilliant musician! He's a musician's musician. He was Julliard trained. I've seen him in concert 3 times over 25 years and he brought the house down every time.
Ever heard his song, "The Longest Time"? It's all a capella, and every voice is his!
Joel is actually self taught for the most part. He was a high school dropout who’s musical traning was private piano lessons when he was a kid.