Sigur Ros' fourth LP has been leaked a week ahead of its global Internet release.

Downloadable copies of the album first appeared on torrent sites in the last three days and the album is now available for illegal streaming from one music website.

Takk, Icelandic for thanks, will be available for global download on August 15. The Internet release will be followed by a hardcopy limted edition casebound book version released on September 11.