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Robin Gibb's ongoing health problems forced him to miss the premiere of his debut classical work, with the star now recovering from pneumonia.
At one stage he had been aiming to attend and even perform the song Don't Cry Alone at The Titanic Requiem concert in London on Tuesday night.
But a further flare-up of ill health for the 62-year-old singer - who has been treated for colon cancer - caused him to cancel a number of commitments last month.
And he was also unable to make it to the concert - to mark the centenary of the ship's ill-fated voyage - at London's Westminster City Hall.
His son RJ Gibb - with whom he created the work - told the audience: "Unfortunately my father is still in hospital and is unable to be here this evening."
"He sends all his love. We are all praying for him and hoping he has a speedy recovery."
A spokesman said that the star was recovering in hospital from pneumonia.
Last month he underwent surgery for an ongoing problem with a twisted bowel. The same hereditary intestinal condition led to the death of his twin brother Maurice at the age of 53.
