Sid Selvidge, a Memphis-based singer, guitarist and cultural treasure, and an ardent champion of blues and roots music, who helped launch and served as executive producer of the internationally syndicated Beale Street Caravan radio program, died May 2 at Methodist University Hospital. He was 69 and had been battling cancer. [To read the full article, including reflections from singer-songwriter Amy Speace, who toured with Selvidge in 2010, click on the headline.]