Former Frasier star Kelsey Grammer, British funnyman Ricky Gervais and satirist 'WEIRD' AL YANKOVIC are all to appear on a new compilation album featuring the hits of The Simpsons. Show producers have remastered almost 40 original songs from the past nine seasons of the cult cartoon series for new release The Simpsons: Testify. Jackson Browne, Shawn Colvin, David Byrne and the B-52's also feature on the eclectic album. Highlights include Grammer, as Krusty The Klown, crooning The Very Reason That I Live and Gervais singing Lady.