Glen Campbell, the grinning, high-pitched entertainer whose dozens of hit singles included Rhinestone Cowboy and Wichita Lineman and whose appeal spanned country, pop, television and movies, passed away on Monday, his family has said.

He was 81.

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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.

"He was a wonderful session musician as well. A lot of people don't realize that. But he could play anything and he could play it really well."

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.

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 performance of the title song from True Grit a 1969 release in which he played a Texas Ranger alongside Oscar winner John Wayne, received an Academy Award nomination. He twice won album of the year awards from the Academy of Country Music and was voted into the Country Music Hall of Fame in 2005. Seven years later, he received a Grammy for lifetime achievement.

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."

Campbell was among a wave of country crossover stars that included Johnny Cash, Roy Clark and Kenny Rogers, and like many of his contemporaries, he enjoyed success on television.

Campbell had a weekly audience of some 50 million people for the "Glen Campbell Goodtime Hour," on CBS from 1969 to 1972.

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.

He released more than 70 of his own albums, and in the 1990s recorded a series of gospel CDs. A 2011 farewell album, "Ghost On the Canvas," included contributions from Jacob Dylan, Rick Nielsen of Cheap Trick and Billy Corgan of Smashing Pumpkins.

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.

Campbell's musical career dated back to the early years of rock 'n roll. He toured with the Champs of "Tequila" fame when the group included two singers who formed the popular '70s duo Seals & Crofts. He was part of the house band for the ABC TV show Shindig! and a member of Phil Spector's "Wrecking Crew" studio band that played on hits by the Ronettes, the Righteous Brothers and the Crystals. He played guitar on Frank Sinatra's Strangers In the Night, the Monkees' I'm a Believer and Elvis Presley's Viva Las Vegas.

"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."

A sharecropper's son, and one of 12 children, he was born outside of Delight, Arkansas, and grew up revering country music stars such as Hank Williams.

"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.

He opened for the Doors and sang and played bass with the Beach Boys as a replacement for Brian Wilson, who in the mid-'60s had retired from touring to concentrate on studio work. In 1966, Campbell played on the Beach Boys' classic "Pet Sounds" album.

"I didn't go to Nashville because Nashville at that time seemed one-dimensional to me," Campbell said. "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."

Campbell shied from the Smothers Brothers' political humor, but still accepted the offer. He was out of the country when the first episode aired.

"The whole lid just blew off," Campbell said. "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.