BEE Gees singer Robin Gibb has shown "flickers of life" after his brother Barry sang to him to help wake him from his coma, it has been claimed.
His family continue to keep vigil at his bedside, as his wife Dwina said music appeared to be helping.
She said his brother had been singing to him, while his children played music to “try and bring him back to us”.
The Sun newspaper has reported a “source close to the 62-year-old music legend” as saying there have been hopeful signs of recovery but that he was “not out of the woods yet.”
The source said: “There were flickers of life from Robin. His eyes moved and there was an attempt at speech.”
The singer has been in hospital in Chelsea, west London, since he lost consciousness last week, after contracting pneumonia in his fight against cancer.
His wife Dwina, who is at his bedside with their daughter Melissa, 37, and sons Spencer, 39, and Robin-John, 29, has thanked fans for all their support.
In an interview with Northern Irish publication the Impartial Reporter, she said: “Thousands of people are saying prayers every day.
“His brother Barry, his wife Linda and son Stephen came over from America. Barry was singing to him.”
She added she had taken inspiration from her husband’s latest work, a song to commemorate the Titanic called “Don’t Cry Alone” in which a fallen husband reassures his wife “he is only a whisper away”.
A statement on the singer's website RobinGibb.com said: "Sadly the reports are true that Robin has contracted pneumonia and is in a coma. We are all hoping and praying that he will pull through.”
Robin Gibb has enjoyed a musical career spanning six decades, from humble beginnings as part of a sibling trio in 1950s Manchester to his most recent classical venture, the requiem for The Titanic.
In the interim, he sang some of the 1960s and 1970s greatest hits, including Massachusetts, I've Gotta Get A Message To You, Lonely Days, How Can You Mend A Broken Heart, How Deep Is Your Love and Stayin' Alive.
Gibb last performed on stage in February, supporting injured servicemen and women at the Coming Home charity concert held at the London Palladium.
He had been due to premier his classical work, The Titanic Requiem, this month with son Robin-John, but the event went ahead without him due to his poor health.
Gibb had surgery on his bowel 18 months ago for an unrelated condition, but a tumour was discovered and he was diagnosed with cancer of the colon and, subsequently, of the liver.
It had been thought his cancer was in remission as early as last month, but the latest deterioration in his health coincides with reports of a secondary tumour.
His twin brother and bandmate Maurice died from the same bowel condition that initially led doctors to operate on Robin.
Gibb's band the Bee Gees will be best remembered for their contribution to the soundtrack of 1977 film Saturday Night Fever, which turned disco music into a worldwide phenomenon and placed the distinctive look of the era's hairstyles and outfits into pop culture legend.