OffBeat started “Backtalk,” its monthly Q&A in January 1996, when Michael Tisserand interviewed BeauSoleil’s Michael Doucet with brothers Sid and Nathan Williams—the former, the proprietor of El-Sid-O’s; the latter, the leader of Nathan and the Zydeco Cha Chas. Since then, we’ve talked to much of the roots music world and many outside of it. In the process, we’ve got insight into the lives and careers of subjects such as Bo Diddle...