Allman was best known for co-founding the celebrated The Allman Brothers Band alongside his brother Duane Allman.
The American rock band confirmed the news on Twitter by posting, "It is with deep sadness we announce that Gregg Allman... Passed away peacefully at his home."
Singer-actress Cher, who was married to Allman from 1975 to 1979, was quick to express her grief upon hearing the news.
Allman's third and ex-wife shared a picture of them with the caption "never forget....Gui."
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Ringo Starr, John Mayer, Keith Urban, Melissa Etheridge, Jason Aldean and Peter Frampton also mourned the demise of the iconic singer.
Starr wrote, "Rest in peace Greg Allman peace and love to all the family."
"He showed me his tattoos... His voice... His soul. #GreggAllman," tweeted Etheridge under a photo of herself with Allman.
Urban said, "My heart breaks today at the passing of soul brutha Gregg Allman. Blessings and peace to all the Allman family."
Frampton tweeted, "So sad to hear Gregg Allman passed away I admire him so much and had the honour of jamming wth him recently. A gentle soul with so much soul."
Aldean said, "This one hurts a lot. This was one of my heroes. RIP Gregg Allman...
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