Blues legend Keb’ Mo’ is promoting “BLUESAmericana,” his 12th studio album released in 2014. It was nominated for three Grammy awards, topped blues charts and took home a Blues Music Award from the Blues Foundation. Keb’ Mo’ called from his home in Nashville last week to speak with Charleston Scene about the album, a song he helped write in the wake of the Charleston shooting and how he sees the future of blues music. Q: “BLUESAmericana” has been a huge hit with critics and f