High Quality Content by WIKIPEDIA articles! Volta is the Grammy-nominated seventh full-length studio album from Icelandic singer Björk, a follow-up to 2004's Medúlla and comprises ten new tracks. The full album was accidentally made available on the UK iTunes Store at midnight on April 23, 2007 for a total of six hours, two weeks before the album's official release date. This led to the album being leaked online the following day. It has been certified Silver in the UK. A wide array of artists collaborated with Björk on material for the album. Björk first contacted Timbaland about a possible collaboration in December 2005. The first session took place in February 2006 in Studio 4 at Manhattan Center Studios in New York City, USA, soon after Björk had visited Banda Aceh in February 2006 to view some of UNICEF's work with the children who were affected by the tsunami - in May 2005 Björk released the charity album Army of Me: Remixes and Covers to help UNICEF's work in the south east Asian region.