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NASHVILLE, Tenn. (AP) — Glen Campbell’s wife says Alzheimer’s disease has robbed the 80-year-old singer’s ability to play guitar.

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But Kim Campbell tells The Tennessean that her husband occasionally breaks into a solo air guitar routine, which she says is “kind of fun.”

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Glen Campbell was diagnosed with the brain-ravaging disease in 2011 and went on a world tour afterward. The singer known for such hits as “Rhinestone Cowboy,” ”Wichita Lineman” and “Southern Nights” was moved to a long-term care facility in 2014.

Kim Campbell says he continues to sing, although the words are gibberish and “it’s not a melody that we recognize, but you can tell that it’s a happy song and he has a song in his heart,” so that brings her great comfort.

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(© Copyright 2017 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)