Lord Andrew Lloyd Webber and Gary Barlow are teaming up to write a song in honour of The Queen's diamond jubilee year.
Barlow and Webber's songwriting process will be captured on film for a BBC documentary and the fruit of their toil will be performed at a Jubilee concert taking at Buckingham Palace on June 4.
The 'gig' will also feature Sir Paul McCartney, JLS and Elton John.
Gary told BBC Radio 2 that he'll seek inspiration by travelling the planet to discover what people think of The Queen, and excitedly added that "this is probably the biggest challenge I've ever taken on musically".