Music mogul Simon Cowell and comedian Harry Hill were joined by celebrity friends at the opening of their joint venture 'I Can't Sing! The X Factor Musical'.<br/> <br />The £6 million production put on at the London Palladium parodies the famous talent show, telling the story of two lovestruck singers who audition for Simon and his panel of judges.<br/> <br />After the performance Cowell took to the stage.<br/> <br />Crowds seemed enthusiastic as they left the theatre, UK X Factor judge in particular.<br/> <br />SOUNDBITE (English) UK X Factor judge, Louis Walsh, saying:<br/> <br />"I thought it was fantastic. I'm going to come back again and again. It's funny, it's brilliant and it's got the X Factor."<br/> <br />Harry Hill who penned the musical seemed equally pleased with the night's events.<br/> <br />SOUNDBITE (English) Comedian, Harry Hill, saying:<br/> <br />"Thrilled. It's never gone, it's never gone better. The cast were fantastic and it sounded great too. It was a brilliant audience reaction and I've talked to Simo
