X is the tenth studio album by Australian singer Kylie Minogue, released on November 21, 2007, through Parlophone. It is a dance-pop and electronica album that explore themes of sex and celebration. Music critics praised the production but were ambivalent towards its consistency and lyrical content. Five singles were released from X. The lead single, "2 Hearts", peaked inside the top 10 in several countries, including Australia, Spain and the United Kingdom. "Wow" was released in Australia and the UK, while "In My Arms" was issued in Europe. "All I See" and "The One" were released as digital singles: the former to promote the album in the United States and the latter in Europe. Minogue promoted X by performing in the US during March and May 2008, and with the KylieX2008 concert tour, which saw her perform around Europe, Oceania, South America, and Asia. The album has sold over one million copies worldwide. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.