Hilarious but never mean. Eccentric but easily accessible. Weird Al Yankovic has made a career of parody and pastiche while remaining true to his own idiosyncratic style for more than four decades.

John Mayer — bespectacled, grinning goofily, very much nerding out — is sitting across from “Weird Al” Yankovic, interviewing the Hawaiian shirt-clad parody music king, who is sitting across from him ...