The album was co-produced by Musgraves, Ian Fitchuk, and Daniel Tashian.
She also took home awards for best country album, best country song and best country solo performance.
"It was unbelievable to be even in a category with such gigantic albums ... it's really crazy. But I'm very thankful. Art is really thriving and it's been really beautiful to see that. I would have nothing without songs. To me, it's just all about the songs," Musgraves said in her acceptance speech.
The last country LP to win Album of the Year came in 2010, with Taylor Swift's ' Fearless'.
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