The life and times of blues legend BB King

When Jon Brewer set out to tell the story of musician BB King, the phone didn't stop ringing with stars wanting to get involved.

Bono, Eric Clapton and Ringo Starr were just some of the names who called asking to pay tribute to the blues legend.

Jon's remarkable documentary, BB King - The Life of Riley - is on BBC Four tonight. He popped in to tell us about it.