Wilco has set a release date for its next studio album, Sky Blue Sky. The groups first album since 2004s A Ghost is Born will hit stores May 15, though several tracks from the disc have already hit the blogs (and have since been removed). The disc is Wilcos first to feature multi-instrumentalist Pat Sansone and guitarist Nels Cline, the latter of whom helps push the group into more avant-garde and jam-rock territories. Several tracks, including the current live staple Walken, will likely be stretched out in concert. Wilcos international tour will kick off April 16 in Brisbane, Australia.