Tinariwen's fifth album is both its boldest and its most pared down. The Touareg band is joined by unlikely guests, a move that could feel forced. Instead, Nels Cline's guitar adds the subtlest layer and TV on the Radio's doo-wop-through-the-looking-glass crooning folds into the mournful vocal texture. The Dirty Dozen Brass Band's weary funereal horns feel almost organic on the meditative groove of "Ya Messingah." Alone, Tinariwen gets more intimate than ever, abandoning amplification and ululation for the solo vocals and the hushed acoustic instrumentation of Tamashek folk music.