125,000 people each night, making it the biggest event in UK music history. Memorable performances included "Come Undone" where he interjected with "Britain, I'm Your Son", and further interacted with the audience when he brought a girl up on stage. In October 2003, Williams released a live album of the concerts, Live at Knebworth. In October 2004, Williams released, Greatest Hits, a retrospective of his career, and also, to reveal the new tracks he had been working on with the then-new collaborator, Stephen Duffy. "Radio", the compilation's first single, debuted at number one in the UK Singles Chart (becoming Williams' sixth number-one hit). When the compilation was later released it debuted at number one in the UK and was the best selling album of the year in the UK and Europe. Eight years after the release of "Angels", the British public voted it as the "Best Single of the Past Twenty-Five Years" at the 2005 Brit Awards. After touring Latin America in late 2004 for the promotion Greatest Hits, Williams started working on his sixth studio album. Recorded at his house in the Hollywood Hills, the album was co-written by Stephen Duffy over the course of 24 months. The album Intensive Care was launched in Berlin on 9 October. It became an international hit. In November 2005, Williams took home the MTV Europe Music Award for 'Best Male', but also, entered in The Guinness Book of World Records when he announced his World Tour for 2006, selling 1.6 million tickets in one single day. Williams kicked off his Close Encounters World Tour in South Africa in April 2006, when he finished his European leg of the tour. 2.5 million people had seen the show, and after touring Latin America and Australia the numbers went up to 3 million. 2006–2009: Rudebox and Reality Killed the Video Star Williams released his much anticipated dance/electro album, Rudebox, on 23 October 2006. It featured collaborations with the Pet Shop Boys, William Orbit, Soul Mekanik, Joey Negro, Mark Ronson, Chris Grierson, and The Orr Boys. It received mixed reviews: Allmusic gave it a four star rating, the NME 8 out of 10, and Music Week and MOJO were equally positive, but it received much weaker reviews from some of the British press. The album sold 2× Platinum in Europe with sales of over 2 million making it the fastest platinum-selling album of 2006. To promote