Finally this week, nine heavenly face-offs between kora and cello. Over the past few years, the kora has found a home in western salons as well as world music festivals, its serene and rarefied tone given a classical gloss on albums like Toumani Diabaté’s “Mandé Variations”. Ballaké Sissoko and Vincent Segal’s artfully-titled “Chamber Music” (2009) exploited that connection, pitting the Malian kora master and French cellist in a series of agile duets. “Musique De Nuit” is a quietly ravishing follow-up, recorded in part on Sissoko’s Bamako rooftop; distant city hum can sometimes be detected beneath the pair’s refined jousting. Nimble takes on Malian party music (“Super Etoile”) are inventive additions. Mostly, though, an airy grace predominates, pitching the duo as baroque successors to the seminal Toumani Diabaté/Ali Farka Touré hook-up.