LONDON – JULY 07: Christopher Guest of spoof American heavy metal band Spinal Tap performs on stage during the Live Earth concert held at Wembley Stadium on July 7, 2007 in London. Live Earth is a 24-hour, 7-continent concert series taking place on 7/7/07, bringing together more than 100 music artists and 2 billion people to trigger a global movement to solve the climate crisis. (Photo by Gareth Cattermole/Getty Images)