Amy Winehouse is reportedly determined to perform at Nelson Mandela's 90th Birthday Concert and Glastonbury this summer, despite her hospitalisation for emphysema.

The ailing singer's father Mitch has spoken of his fears for his daughter after tests revealed that she was in the early stages of the lung disease.

He told a UK newspaper, "With smoking the crack cocaine and the cigarettes her lungs are all gunked up.

“There are nodules around the chest and dark marks. She's got 70 percent lung capacity."

He added, "The doctors have told her if she goes back to smoking drugs it won't just ruin her voice, it will kill her."

Despite her precarious condition, Amy still intends to perform for Mandela at Friday's gig in London's Hyde Park – but with a few changes to her back-stage requirements.

Here usual rider of alcopops and vodka, will be replaced with a private hospital suite complete with massage bed and paramedics, according to the Daily Mail.