Sir George Ivan Morrison OBE is a Northern Irish singer-songwriter, instrumentalist and record producer.
Grammy-winning American singer Dr John has died at the age of 77 after suffering a Heart Attack .
The New Orleans -born musician died on Thursday, according to a message posted on his official Twitter account.
The Rock and Roll Hall of Fame singer combined the genres of blues, pop, jazz, boogie woogie and rock and roll.
The musician "created a unique blend of music which carried his hometown, New Orleans , at its heart, as it was always in his heart," it continued.
Blondie lead singer Debbie Harry was among those to pay tribute, sharing a picture of herself alongside the six-time Grammy winner.
His career started in the late 1950s, when he became prominent as a pianist and singer on the New Orleans music scene.
Born Malcolm John Rebennack in New Orleans , his love of music was fostered by his father, who ran an appliance store that also sold records.
His mother, meanwhile, had worked as a model, and thanks to her connections, Malcolm's face appeared on boxes of Ivory Soap.Fateful shooting
Despite being kicked out of The Church choir, he pursued his love of music, attending local clubs and working at a studio in town during his teens.
His first love was The Guitar , but he had to switch to piano after being shot while trying to defend a bandmate who was being pistol-whipped in 1960.
"Ronnie was just A Kid and his mother had told me 'You better look out for my son,'" he told Smithsonian. com in 2009.
"Oh God, that was all I was thinking about. I tried to stop the guy, I had my hand over the barrel and he shot. "
The Dr John character, modelled on a voodoo priest, was created in the late 1960s.
"I never thought I would be doing another record. I never wanted to be a frontman. All of a sudden, I got into it, and it wasn't as bad as I thought. "Grammy Awards in 2013
His live shows were known for their carnival atmosphere and he would wear costumes of bright colours, feathers and plumes, and scatter glitter on The Audience .
The musician, who successfully battled heroin addiction, was inducted into The Rock and Roll Hall of Fame by singer John Legend in 2011; and won his most recent Grammy in 2012 when Locked Down was named best blues album.
He was married twice and told he had "a lot" of children.