Glen Campbell

The Rhinestone Cowboy passed away on Tuesday (Aug. 8, 2017) at age 81 after a years-long battle with Alzheimer's disease.

Music legends, politicos and TV stars are among the thousands of fans taking to Twitter to pay tribute to country music great Glen Campbell, who died early Tuesday after a long battle with Alzheimer's disease.

Dolly Parton declared Campbell, "one of the greatest voices of all time," Kathie Lee Gifford called him a "towering talent & a tenderhearted, delightful man" while country star Brad Paisley thanked him "for the artistry, grace & class you brought to country music. You were a shining light in so many ways."

Campbell, whose hit tunes like "Rhinestone Cowboy," "Gentle on My Mind" and "Wichita Lineman" propelled him to musical stardom in the 1960s and 1970s, also proved a formidable force on the big and small screens with TV shows like the CBS variety program The Glen Campbell Goodtime Hour and in film, like with his supporting role in the John Wayne classic True Grit, for which he also earned a Grammy nomination for the title song.

The singer also put up a brave front in the face of Alzheimer's, taking on a 15-month farewell tour while battling the disease, which wrapped up in 2012, followed by a final studio recording, Adiós, a collection of covers recorded following the final tour but released this past June.

"Heartbroken. I owe him everything I am, and everything I ever will be," Campbell's daughter, Ashley, who is also a singer, wrote on Twitter, accompanied by a photo of her grasping her father's hand. "He will be remembered so well and with so much love."

See more celebrity tributes to Glen Campbell below.

Copyright 2017 ZoomerMedia Limited