The world of music is in mourning now, wrapped in a shroud of shock.  Robin Gibb, one-third of the famous Bee Gees, died earlier today in a London hospital. 

Gibb, 62, had briefly rallied in the last few weeks, after slipping into a coma a month ago..  His brother Barry, his wife Dwina, his children, and his mother stayed at his bedside until the very end.

The famous Gibb brother, who with his siblings Maurice and Barry helped make the disco era popular, suffered from liver cancer, being hospitalized in 2011 with complications from the disease.

Gibb seemed to be doing well until recent weeks, even finding the inspiration and energy over the past year to compose the classical music piece, "Titanic Requiem", with his son, RJ.  The piece was in memory of those who died when the Titanic sank in 1912, 100 years ago.  Gibb was unable to attend the premiere of his masterpiece on the anniversary of the sinking last week, slipping into a coma after contracting pneumonia.

Maurice, Barry and Robin Gibb of the Bee Gees on April 06, 1989. (Photo by Larry Ellis/Express/Getty Images)

Robin Gibb will be remembered by fans for his unmistakeable falsetto voice, which drove the hit singles "I Started a Joke" and "I Gotta Get a Message to You", to the top of the charts for the Bee Gees.

Robin's twin brother Maurice died in 2003 from a twisted bowel. Their youngest brother Andy Gibb died in 1988 of a heart infection.