The Four Martins is a fascinating blend of four acoustic guitarists, including Juan Martin (flamenco) and Martin Taylor (jazz) plus Martin Carthy and Martin Simpson, both of whom come from the folk tradition of the British Isles. The 90-minute concert is a mixture of numbers drawn from each of their backgrounds, though the results are truly world music. All four men are featured in the richly textured flamenco "La Pasion del Lamento," with Martin and Taylor exchanging the lead lines and the folk artists providing rhythm accompaniment. The roles are reversed for the folk tune "Glass of Water," sung by Carthy.