Try Ralph Towner/Gary Peacock's "A Closer View" on ECM. Wonderful recording of a guitar and bass duo. From a review "Peacock's ability to combine the soulfulness of Charles Mingus with the virtuosity of Scott LaFaro makes him probably the world's most expressive double-bassist. His remarkable qualities reinvigorate the playing of Towner, whose mastery of the guitar is equally extraordinary.."
Another recommendation: Luciana Souza, "Brazilian Duos" From the review: On this CD, Souza's fluid and floral vocals, which swing on every Portuguese-language phrase, are backed by three alternating Brazil-born guitarists--Romero Lubambo, her father, and Marco Pereira on eight-string guitar--performing compositions by Luis Gonzaga, Edú Lobo, Jacó do Banbolim, Antonio Carlos Jobim, and Souza's parents. The combination of the plaintive and percussive guitar playing and Souza's sinewy voice is hard to beat.
Another recommendation: Luciana Souza, "Brazilian Duos" From the review: On this CD, Souza's fluid and floral vocals, which swing on every Portuguese-language phrase, are backed by three alternating Brazil-born guitarists--Romero Lubambo, her father, and Marco Pereira on eight-string guitar--performing compositions by Luis Gonzaga, Edú Lobo, Jacó do Banbolim, Antonio Carlos Jobim, and Souza's parents. The combination of the plaintive and percussive guitar playing and Souza's sinewy voice is hard to beat.