In 2008, Aqua reunited and promised a 25-concert tour that was to have commenced in the summer. Offers were received by the record company from locations in Denmark, Canada, United States and United Kingdom. Aqua finally performed 8 concerts around Denmark as part of the "Grøn koncert" festival. They released their second greatest hits album on 15 June 2009, which includes 16 old remastered tracks and three new songs: "My Mamma Said", "Live Fast, Die Young", and their first single in eight years, "Back to the 80s", which was released in Denmark on 25 May 2009. "Back to the 80s" debuted at number one in Denmark where it stayed for six weeks, becoming the band's fifth number-one single. It has since been certified platinum by the International Federation of the Phonographic Industry (IFPI) for sales of 30,000 copies in Denmark. Aqua has also toured Scandinavia between May and August 2009 and performed at several gigs in Germany, United Kingdom and France. The greatest hits album was released in North America and many European countries on 22 September 2009 and in the UK on 29 September 2009.