In a great Piedmont blues pairing, Phil Wiggins played harmonica alongside guitarist John Cephas for more than 30 years. Cephas died last year, but Wiggins has found a new match, for the time being, in Corey Harris. No longer playing against Cephas' resonant guitar and smooth voice, Wiggins now works against Harris' more soulful twang. His blues influenced by West African and Caribbean traditions, Harris picks percussively, biting back at Wiggins. Wiggins answers, bending his notes in a dirty old way. —Andrew Ritchey