February 22, 2015 9:47 PM EST

From one country great to another: Tim McGraw paid homage to one of his forbears at the Oscars, performing a moving tribute to Glen Campbell.

The documentary Glen Campbell: I’ll Be Me follows the farewell tour of Campbell, a famed country performer (known for his rendition of “By the Time I Get to Phoenix”) who’s leaving the spotlight after an Alzheimer’s diagnosis. Its Oscar-nominated theme song “I’m Not Gonna Miss You,” performed by McGraw during the Oscars telecast, was co-written by Campbell.

“It’s not gonna hurt me when you cry,” McGraw sang, but some country fans in the audience may well have shed a tear regardless.

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