Passage: ...the most important blues musician who ever lived. He was true, absolutely, to his own vision, and as deep as I have gotten into the music over the last 30 years, I have never found anything more deeply soulful than Robert Johnson. His music remains the most powerful cry that I think you can find in the human voice, really. ... it seemed to echo something I had always felt.

Question: how many years has he gotten into music
30 years