Bee Gees singer Robin Gibb had been writing a 'bucket list’ before he slipped into coma, it has emerged.

The 62-year-old, who had been battling colon and liver cancer, is believed to have just days to live after he was recently hospitalised with pneumonia.

Evidence of his fighting spirit was revealed today after a friend admitted the star had been making a list of things he still wanted to achieve shortly before his return to hospital.

The source told the Mirror: “He has kept an antique notebook by his bed to write down lyrics and ideas he has had floating around in his head.

“He has also expressed a desire to set up a children’s charity involving music. It was a ‘bucket list’ of things he wanted to achieve. But everyone is very worried now.”

Scroll down for a gallery of images of Gibb and the Bee Gees

His wife Dwina and son Robin-John, 29, are maintaining a bedside vigil and the singer’s brother Barry 65, and mother Barbara, 91, are also with him.

News of Gibb's condition broke on Saturday. A friend told The Sun: "Our prayers are with Robin. He has kept so positive and always believed he could beat this.

"If there is anyone you would put money on pulling through such a dire situation, it would be Robin because he is a fighter. But this is a battle he will struggle to win."

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.

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. Because of this situation, Robin's website is temporarily unavailable. Sorry for any inconvenience."

Gibb's twin brother and bandmate Maurice died from the same bowel condition that initially led doctors to operate on Robin. His younger brother Andy, who was not part of the Bee Gees but a successful singer in his own right, died in 1988 from heart failure at 30.

Celebrities have been tweeting their prayers and best wishes for Robin

@peterframpton
Peter Frampton

My positive thoughts go out to Robin Gibb and all of the Gibb family. I am wishing you the best and hope for a quick recovery. Much love 2 U

April 14, 2012 7:27 pm via web Reply Retweet Favorite

@MrDuncanJames
Duncan James

MY thoughts and prayers are with robin Gibb and his family at this time. Such a wonderful man x

April 14, 2012 2:05 pm via Twitter for iPhone Reply Retweet Favorite

@BrianMcFadden
Brian Mcfadden

Thinking about robin gibb. My thoughts are with his family. Hope he fights thru or lives his last days peacefully.

April 14, 2012 8:50 am via Twitter for iPhone Reply Retweet Favorite

@TopCatTC69
Anthony Cope

@tonyblackburn Morning from TC to TB. Thoughts and prayers with Robin Gibb and family. He has done so much for music in UK & Globally. X

April 15, 2012 6:30 am via Twitter for BlackBerry® Reply Retweet Favorite

@NickyAACampbell
Nicky Campbell

wishing lovely Robin Gibb and family every strength. Keep fighting Robin.

April 14, 2012 9:26 am via web Reply Retweet Favorite

@ronanofficial
Ronan Keating

Just heard about Robin Gibb. So sad. My thoughts are with all his family

April 14, 2012 8:18 am via Twitter for iPhone Reply Retweet Favorite

Loading Slideshow

• The Bee Gees (L-R) Barry, Maurice, Robin Gibb at Heathrow Airport, London, before leaving for a 3 month World Tour. 1974

• The Bee Gees, (l to r) Robin, Barry and Maurice Gibb, accept the Brit Award for Outstanding Contribution in 1997

• The Gibb brothers: Barry (centre) and twins Maurice (left) and Robin (right)

• Bee Gees Singer Robin Gibb reads to his son Spencer, circa 1974

• Bee Gees Singer Robin Gibb with his wife Molly Hullis (r) and two children Spencer and Melissa in his home, circa 1974

• The Bee Gees, back row, left to right: Barry Gibb, Robin Gibb, and Vince Melouney. Front, left to right: Dennis Bryon and Maurice Gibb. 1967

• Robin Gibb, founding member of the Bee Gees, unveils a plaque honouring the work of the Bee Gees at 67 Brook Street, central London. 2008

• Robin Gibb performs at the BBC Electric Proms 2008 - Saturday Night Fever at the Roundhouse, Chalk Farm, London.

• Official ambassador Robin Gibb CBE (centre) with his wife Dwina and son arriving for The Sunseeker International Charitable Trust Ball - in aid of The Outward Bound Trust - at Battersea Evolution in south London. 2009

• Robin Gibb and his wife Dwina at No.11 Downing Street in London for the Diana Awards.

• Members of the Bee Gees pose with Barry Manilow, far right, at the American Music Awards in Los Angeles, Ca., Friday, Jan. 13, 1979. The brothers Gibb, from left, Barry, Maurice, and Robin, won awards for favorite popular group and favorite soul album

• The Bee Gees, from left, Robin, Barry and Maurice Gibb, attend a party in 1978

• Andy Gibb eats a cherry from his birthday cake at a party given by his family in his home in Miami Beach, Fla., Monday night, March 6, 1979. Andy's brothers, the Bee Gees, from left are, Robin, Barry and Maurice. (AP Photo)

• British singer Robin Gibb arrives for the 46th Goldene Kamera (Golden Camera) media award gala in Berlin, Germany, Saturday, Feb. 5, 2011