He may bill himself as The King of the Swamp Blues, but Louisiana music legend Tabby Thomas is most intriguing in the ways he doesn’t live up to that title. For one thing, his bearing isn’t regally pompous; he’s quite the affable and low-key veteran, one who’s mentored any number of South Louisiana blues masters when he could have easily hogged the spotlight. His musical stylings are also considerably less monochromatic than you might expect—although he’s been f...