sentences:  The two remaining living ex-Beatles, Paul McCartney and Ringo Starr, were among those who paid tribute to the singer, while Cocker's agent, Barrie Marshall, said that Cocker was "without doubt the greatest rock/soul singer ever to come out of Britain".On 11 September 2015, a "Mad Dogs & Englishmen" tribute concert to Joe Cocker was performed at the Lockn' Festival featuring Tedeschi Trucks Band, Chris Stainton, Leon Russell, Rita Coolidge, Claudia Lennear, Pamela Polland, Doyle Bramhall II, Dave Mason, John Bell, Warren Haynes and Chris Robinson, among others.In commemoration, a Joe Cocker Mad Dogs and Englishmen Memory Book was created by Linda Wolf to celebrate the event.