"So Far, So Good... So What!" was released in January 1988 and was well received by fans and critics. The album featured a cover version of the Sex Pistols' "Anarchy in the U.K."; Mustaine changed the lyrics, later saying that he had simply heard them incorrectly. To support the album, Megadeth embarked on a world tour that lasted for nearly eight months. The band (along with Savatage) opened for Dio on the "Dream Evil" tour and supported Iron Maiden on their "Seventh Son of a Seventh Son" tour, both in the United States. They also headlined a North American tour with Warlock and Sanctuary (whose debut album "Refuge Denied" was produced by Mustaine), and a European trek with Testament, Nuclear Assault, Flotsam and Jetsam and Sanctuary.