I was listening to an archived interview with Dr. John and Terry Gross in my NPR podcast channel. In the interview, Gross asked John how should she describe him: Singer, piano player, songwriter, composer?
Now I have been following Dr. John for a long time. Born Mac Rebinac, he started as a guitar player in New Orleans. He was (accidentally) shot in the hand, so he switched to piano. He's a boogie woogie, Cajun, shaman bandleader. He’s diverse enough to be in The Last Waltz and Exile on Main Street.