The singer-songwriter released 14 solo albums starting with 1972′s Naturally. His most recent outing was 2009′s Roll On. He was a pioneer of the Tulsa sound – an amalgamation of blues, country and jazz known for its laid-back feel.

Eric Clapton was a fan, recording a cover of Cale's 1976 track "Cocaine" after having previously released a take of "After Midnight." Cale's songs were also covered by acts as diverse as Captain Beefheart, Lynyrd Skynyrd, Carlos Santana, Kansas and Tom Petty.

A statement on his official website says: "JJ Cale passed away at 8.00pm on Friday July 26 at Scripps Hospital in La Jolla, CA. The legendary singer / songwriter had suffered a heart attack. There are no immediate plans for services."