I saw them last time they were in San Francisco and it was the most pleasing live music I've experienced in a very long time. Buy tickets right now and then go listen to a little bit to whet your ears. My favorite part from the live show was when Raichel (piano) and Touré (guitar; he's the son of Ali Farka Touré) had a musical conversation: you can sort of imagine Dueling Banjos but, instead of challenging and repeating, it sounded to my barely musically educated ears like they were having a conversation, or even telling jokes, and it sounded lovely even when I didn't get the jokes, but a few of the jokes I understood, or imagined I understood, for example an arpeggio to be a punchline, and I laughed a little bit too. And then the calabash player and the bass player did the same thing and were just as good and funny.
(Also: Seattle on Nov 15 and Toronto on Nov 21)