Robert Plant looked back at this 38-year solo career as featured on his newly released double-disc compilation, Digging Deep. The former Led Zeppelin front man joked to Rolling Stone, “When I listen to it, I wonder whether the guy who was singing and writing the lyrics ever had a rest. I mean, did he ever take a vacation? What on earth was going on? And why didn’t he just shut the f*** up for a while and learn something new, like applied mathematics or astronomy? But yeah (Digging Deep) just rolls with so much gusto.”

CHECK IT OUT: Robert Plant’s 2010 Band Of Joy video, “Angel Dance”: