X is the tenth studio album by Australian singer Kylie Minogue. EMI Music Japan released it first in Japan on 21 November 2007, before its release in Australia by Warner Music Australia two days later. The album was released in the United Kingdom by Parlophone on 26 November 2007, and in the United States by Capitol and Astralwerks on 1 April 2008. Work on the album began in July 2006, following Minogue's gradual recovery from breast cancer. After finishing Showgirl: Homecoming Tour in early 2007, she returned to the studio to complete the album, with the help from many producers including Bloodshy & Avant, Calvin Harris, Greg Kurstin, and Freemasons.