Green Day's sixth studio album was released October 3, 2000, recorded March - April 2000 at Studio 880 in Oakland, California. This was the first album since signing to Reprise that Rob Cavallo did not produce (though he was still an executive producer for the album). This album marked a significant change in Green Day's sound, with the band deciding to include a wider variety of instruments and more acoustic guitars. The album received mixed criticism, but still listed at #4 on Billboard during it's release. The album has sold over 3 million copies worldwide since it's release.