At first glance, Billy Joel might seem like an odd choice for this list. After all, the man just did a long podcast interview with Alec Baldwin, and he's a regular on the Hamptons social scene. He's also done Q&A sessions with college students, and last fall he even performed at New York's Beacon Theater for Sting's 60th birthday show. These are not the moves of a rock recluse. But consider the fact that Joel's last album of original material, River of Dreams, came out over 19 years ago. He hasn't played a single real concert since 2010, and he has no known plans to return to the road in the foreseeable future.
Barrett Scale: 0.5. Cancelling a memoir at the last minute, going two decades without a new album and getting off the road are classic signs of recluse-dom – but Joel is just too out there in public to say he's truly disappeared.