Alzheimer's has made it difficult for Glen Campbell to remember names and people, but he has no problem performing on stage. ET got a look at the documentary about the country legend's diagnosis.
Country legend Glen Campbell refuses to be silenced by Alzheimer's
It’s a battle between country star Glen Campbell’s oldest children and his wife of 32 years - over who should be in charge of his medical and financial decisions.
Glen Campbell, center, Kim Woolen, left, and Ashley Campbell arrive at the 54th annual Grammy Awards on Sunday, Feb. 12, 2012 in Los Angeles. (AP Photo/Chris Pizzello)
American country singer Glen Campbell in a relaxed mood in London on April 2, 1977. Campbell, who is in Britain for a concert tour, is currently high in the charts with "Southern Nights" his new single taken from an album of the same name. (AP Photo)
Country singers Glen Campbell and Kimberly Woolen of Newport, N.C., are shown following their wedding in Phoenix, Ariz., Oct. 25, 1982. Woolen is a former dancer at Radio City Music Hall. (AP Photo)
THE TONIGHT SHOW STARRING JOHNNY CARSON -- Pictured: Musician Glen Campbell, on September 12, 1975 -- (Photo by: NBC/NBCU Photo Bank via Getty Images)
Glen Campbell, left, who wants to become a star in the pop music field, poses with Tommy Smothers as Campbell gets set to take over as host of the Smothers Brother summer replacement show in Hollywood on Feb. 28, 1968. It's the most promising opportunity to date for Campbell, who played guitar for five years for such singers as Frank Sinatra and Dean Martin. Campbell hit success last December with a haunting lament, "By the Time I Get to Phoenix." That's when he decided to quit playing accompaniments and devote full time to his own career. (AP Photo/ABC TV)
Glen Campbell, left, and Bobbie Gentry, center, hold the Grammy's they won in Hollywood on March 1, 1968, for best recorded singing performances of the year. Presentations were made by the National Academy of Recording Arts and Sciences. Campbell won several awards for âBy the Time I Get to Phoenix.â Miss Gentry won top female honors for âOde to Billie Joe.â Man at right unidentified. (AP Photo/Harold Matosian)
Glen Campbell arrives at the 16th Annual Women in Film Malibu Golf Classic at the Malibu Country Club on Saturday, July 13, 2013 in Malibu, Calif. (Photo by Richard Shotwell/Invision/AP)
Glen Campbell at Grammy Awards in Los Angeles, California on Feb. 24, 1982. (AP Photo/Reed Saxon)
Country singer Glen Campbell kisses his putter after surviving shootout on 17th at Pebble Beach golf course in Pebble Beach, Ca., Feb. 3, 1988. He went on to win from San Francisco 49ers Dwight Clark. (AP Photo/Sal Veder)
Longtime Gene Autry sidekick Pat Buttram, left, and singer Glen Campbell, right, join Autry at the opening night celebration of the Gene Autry Western Heritage Museum in Los Angeles on Monday, Nov. 22, 1988. (AP Photo/Reed Saxon)
Singers Glen Campbell, left, and Jose Feliciano appear on Glen Campbell's television program, Feb. 11, 1969. (AP Photo)
Country singer Glen Campbell is shown in 1968. (AP Photo)
Country singer Glen Campbell is shown in this Monday, Nov. 24, 2003, Maricopa County Sheriff's Office booking handout photo at the Madison Street Jail in Phoenix. The singer was freed Tuesday on $2,000 bail on charges of extreme drunken driving, hit and run, and suspicion of assaulting a police officer. (AP Photo/Maricopa County Sheriff's Office)
In this photo taken Thursday, Sept. 6, 2012, singer Glen Campbell performs during his Goodbye Tour in Little Rock, Ark. (AP Photo/Danny Johnston)
Country singer Glen Campbell, who has Alzheimer's disease, stands with his wife Kim during a news conference on Capitol Hill in Washington, Tuesday, May 15, 2012.(AP Photo/Charles Dharapak)
Keith Carradine, right, presents the Glen Campbell courage award to Kim Woollen at the 22nd annual "A Night At Sardi's" to benefit the Alzheimer's Association at the Beverly Hilton Hotel on Wednesday, March 26, 2014, in Beverly Hills, Calif. (Photo by Jordan Strauss/Invision for Alzheimer's Association/AP Images)
Glen Campbell performs during the 54th annual Grammy Awards on Sunday, Feb. 12, 2012 in Los Angeles. (AP Photo/Matt Sayles)
Glen Campbell, left, Reid Perry, center, and Blake Shelton perform during the 54th annual Grammy Awards on Sunday, Feb. 12, 2012 in Los Angeles. (AP Photo/Matt Sayles)
Glen Campbell, left, and Kim Woollen arrive at the MusiCares Person of the Year gala honoring Paul McCartney on Friday, Feb. 10, 2012 in Los Angeles. (AP Photo/Chris Pizzello)
This CD cover image released by Surfdog shows "See You There," by Glen Campbell. (AP Photo/Surfdog)
Glen Campbell performs at the Stagecoach Music Festival in Indio, Calif. on Friday, May 2, 2008. (AP Photo/Dan Steinberg)
Actor Kevin Costner, right, thanks the gallery on the 18th green of the Pebble Beach Golf Links after he and partner, Glen Campbell, left, won the 3M Celebrity Challenge event of the AT&T Pebble Beach National Pro-Am in Pebble Beach, Calif., Wednesday, Jan. 30, 2002. (AP Photo/Eric Risberg)
Actor James Woods, left, and singer Glen Campbell, right, react on the 18th hole of the Pebble Beach Golf Links after winning the celebrity shootout event of the AT&T Pebble Beach National Pro-Am in Pebble Beach, Calif., Wednesday, Feb. 5, 2003. First round play begins Thursday. (AP Photo/Ben Margot)
Glen Campbell poses with his Pioneer Award during the 34th Annual Academy of Country Music Awards in Universal City, Calif., Wednesday, May 5, 1999. (AP Photo/Kevork Djansezian)
WEST HOLLYWOOD, CA - NOVEMBER 11: Ashley Campbell (L) and Kim Campbell arrive for 'Glen Campbell... I'll Be Me' Los Angeles Premiere at Pacific Design Center on November 11, 2014 in West Hollywood, California. (Photo by Gabriel Olsen/FilmMagic)
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The Rhinestone Cowboy, who has inspired stars like Taylor Swift to Keith Urban, refused to let his debilitating disease slow him down. He went on a final tour of 151 shows. As an extra treat, Campbell invited award-winning filmmaker James Keach along to capture every moment for the documentary "Glen Campbell: I'll Be Me."
Campbell was first diagnosed in 2011. His wife of 31 years, Kim Campbell, revealed the difficult news to the public via People, explaining that she wanted fans to understand what was truly going on with Campbell. "If he flubs a lyric or gets confused on stage, I wouldn't want people to think, 'What's the matter with him? Is he drunk?'"
Campbell's family announced in April that the legend was being moved into an Alzheimer's facility. Rolling Stone got the following statement from the family: "Sadly, Glen's condition has progressed enough that we were no longer able to keep him at home. He is getting fantastic care and we get to see him every day. Our family wants to thank everyone for their continued prayers, love and support."
Campbell's eldest daughter, Debby, told Country Weekly that the star recognizes her, but has his good and bad days. The move to a facility seems to have caused a rift in the family, as Debby notes that she thinks her dad "deserves better" than the facility he's currently in.
In an email to the Associated Press, Kim defended the decision, saying that doctors persuaded her to put the singer in a facility where he could get full-time care.
Watch the video for the full trailer. "Glen Campbell: I'll Be Me" opens October 24.