Forty-eight years after he won his first Grammy Award, country music legend Glen Campbell won another honor, claiming Best Country Song at the 2015 Grammys (with co-writer Julian Raymond) for 'I'm Not Gonna Miss You,' the theme song from 'Glen Campbell ... I'll Be Me,' the documentary that followed Campbell on his farewell tour as he battled Alzheimer's disease.

While the 78-year-old Campbell was not in attendance, his wife Kim took to the podium to speak on behalf of her husband.

"I'm so proud of him tonight," she told the crowd. "It's been an amazing journey. He's been so courageous in bringing awareness to Alzheimer's and caregiving. Sadly, he can't be here with us because he is in the late stages of Alzheimer's, but he is healthy and cheerful."

Kim Campbell also expressed her belief that her husband's love of music has helped him survive.

"I believe music kept him healthy for a longer period of time and enabled him to enjoy his life and his family," she said, "even in the midst of living with a debilitating brain disease."

Campbell is one of the most celebrated artists in country history. He won multiple Grammys back in 1967, then became the first country artist to capture the prestigious Album of the Year Grammy Award in 1968.

Campbell's competition for the award, which goes to the songwriters, was Eric Church and co-writer Luke Laird, for 'Give Me Back My Hometown;' Miranda Lambert with Nicole Galyon and Natalie Hemby, for 'Automatic;' the team of Luke Laird, Shane McAnally and Rodney Clawson, for Kenny Chesney's 'American Kids;' and the team of Tom Douglas, Jaren Johnston, and Jeffrey Steele, for 'Meanwhile, Back at Mama's' by Tim McGraw and Faith Hill.

See a full list of 2015 Grammy winners here.

See Photos From the 2015 Grammy Awards