Albarn spent the majority of 2003 on tour with Blur in support of their newly released album "Think Tank"; however, upon completion of the tour, he decided to return to Gorillaz, reuniting with Hewlett to prepare for a second album. Hewlett explained that the duo chose to continue Gorillaz to prove that the project was not "a gimmick": "If you do it again, it's no longer a gimmick, and if it works then we've proved a point." The result was "Demon Days", released on 11 May 2005. The album was another major commercial success, debuting at No. 1 on the UK Albums Charts and #6 on the US Billboard 200, and has since gone six times platinum in the UK, double platinum in the United States, and triple platinum in Australia, outperforming sales of the first album and becoming the band's most successful album to date. The album's success was partially driven by the success of the lead single "Feel Good Inc." featuring hip-hop group De La Soul, which topped "Billboard"'s Alternative Songs chart in the U.S. for eight consecutive weeks and was featured in a commercial for Apple's iPod. The album was also supported by the later singles "Dare", "Dirty Harry", and the double A-side "Kids with Guns" / "El Mañana".