“This relentless restlessness liberates me,” Björk declares on "Wanderlust” from her 2007 studio album, Volta, which is also the dramatic concluding track of her new Voltaic live CD. “I feel at home whenever the unknown surrounds me.” Volta had been designed, Björk has said, as a journey, with the sound of fog horns and clanging bells linking individual tracks and artists from around the world making guest appearances, including Congolese band Konono No. 1, Malian kora player Toumani Diabaté, pipa virtuoso Wu Man, beat-master Timbaland, Lightning Bolt drummer Brian Chippendale and sublime chanteur Antony Hegarty.