He was 81.
Campbell's family said the singer died last morning in Nashville and publicist Sandy Brokaw confirmed the news. No cause was immediately given. Campbell announced in June 2011 that he had been diagnosed with Alzheimer's disease and that it was in its early stages at that time.
"Glen is one of the greatest voices there ever was in the business and he was one of the greatest musicians," said Dolly Parton in a video statement.
Tributes poured in on social media. "Thank you Glen Campbell for sharing your talent with us for so many years May you rest in peace my friend You will never be forgotten," wrote Charlie Daniels.
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One of Campbell's daughters, Ashley, said she was heartbroken. "I owe him everything I am, and everything I ever will be. He will be remembered so well and with so much love," she wrote on Twitter.
In the late 1960s and well into the '70s, the Arkansas native seemed to be everywhere, known by his boyish face, wavy hair and friendly tenor. He won five Grammys, sold more than 45 million records, had 12 gold albums and 75 chart hits, including No. 1 songs with "Rhinestone Cowboy" and "Southern Nights."
His last record was "Adios," which came out in June and features songs that Campbell loved to sing but never recorded, including tunes made famous by Bob Dylan, Linda Ronstadt and Johnny Cash. Ashley Campbell, also a musician, made a quest appearance and said making the album was "therapeutic."
He gained new fans decades later when the show, featuring his cheerful greeting "Hi I'm Glen Campbell," was rerun on cable channel CMT.
"I did what my Dad told me to do - 'Be nice, son, and don't cuss. And be nice to people.' And that's the way I handled myself, and people were very, very nice to me," Campbell told The Telegraph in 2011.
The documentary "Glen Campbell ... I'll Be Me" came out in 2014. The film about Campbell's 2011-12 farewell tour offers a poignant look at his decline from Alzheimer's while showcasing his virtuoso guitar chops that somehow continued to shine as his mind unraveled. The song "I'm Not Gonna Miss You" won a Grammy for best country song in 2015 and was nominated for an Oscar for best original song.
"We'd get the rock 'n' roll guys and play all that, then we'd get Sinatra and Dean Martin," Campbell told The Associated Press in 2011. "That was a kick. I really enjoyed that. I didn't want to go nowhere. I was making more money than I ever made just doing studio work."
"I'm not a country singer per se," Campbell once said. "I'm a country boy who sings."
He was just 4 when he learned to play guitar. As a teenager, anxious to escape a life of farm work and unpaid bills, he moved to Albuquerque, New Mexico to join his uncle's band and appear on his uncle's radio show. By his early 20s, he had formed his own group, the Western Wranglers, and moved to Los Angeles.
"I didn't go to Nashville because Nashville at that time seemed one-dimensional to me," Campbell told the AP. "I'm a jazzer. I just love to get the guitar and play the hell out of it if I can."
By the late '60s, he was a performer on his own, an appearance on Joey Bishop's show leading to his TV breakthrough. Tommy Smothers of the Smothers Brothers saw the program and asked Campbell if he'd like to host a summertime series, "The Summer Brothers Smothers Show."
"The whole lid just blew off," Campbell told the AP. "I had never had anything like that happen to me. I got more phone calls. It was awesome. For the first couple of days I was like how do they know me? I didn't realize the power of television."
He is survived by his wife, Kim; their three children, Cal, Shannon and Ashley; and his children from previous marriages, Debby, Kelli, Travis, Kane and Dillon. He had 10 grandchildren.
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