This nomadic album, recorded in a natural setting, is as close as you can get to Tinariwen. And also, therefore, to the idea that things can evolve. Bassist Eyadou plays a lot of acoustic guitar; percussionist Said tries his hand at new instruments; Abdallah exhumes songs that he’s never played on stage with Tinariwen. And that violin that ap-pears on several songs and reminds you of the traditional imzad is actually played by Warren Ellis, the violinist in Nick Cave’s band and one of several western guests on the album. Guests include Micah Nelson (son of the country music giant Willie Nelson, and Neil Young’s guitarist), Stephen O’Mal¬ley of (Sunn O))), Cass McCombs and Rodolphe Burger.