In the first decade of the 21st century, a number of Saharan bands comprised of Tuareg musicians have developed a strong following in the U.S. and Europe. Groups such as Tinariwen, Tartit, and Terakaft combine traditional elements with rock to create deeply hypnotic music. Those outfits are from Mali, but Etran Finatawa, which has both Tuareg and Wodaabe members, are from Niger. Vocals are sung in Tamashek, the language of the Tuareg, and in Fulfulde, the idiom of the Wodaabe. Percussion plays a key role, and the deep resonance of a Wodaabe calabash is particularly striking and Tarkat Tajje / Let’s Go!, should please fans of desert-rock. “Aitmani” gives the listener a good idea of the album as a whole: call-and-response singing, rumbling polyrhythm, and spidery, blues-inflected electric guitar runs. One standout, “Daandé,” eschews guitar, but the deep-toned percussion, syncopated handclaps, and back-and-forth vocals are riveting in themselves. The longest track, “Aitma,” has an especially strong groove. It goes on for ten minutes, but once you are pulled into its forward-motion, you want it to go on forever.