Lambert wrote the song with Luke Dick and
Natalie Hemby just three days after she quietly married Brendan McLoughlin, and described the song as "special," saying that "It's got this hope to it. It's got a darkness too, though, but it's also hopeful. Life is going to give you lemons, period. If there wasn't problems then we wouldn't appreciate the great days, but going through those things and overcoming problems—whatever they are—makes us strong and appreciate the sun. You know, it's like ten straight days of rain and then the sun comes out and you're like, 'I forgot how much I loved it.' Since we wrote 'Bluebird,' I've been seeing bluebirds everywhere. And the bluebirds have been there, but I never saw them like I see them now. It kinda reminds me to open my eyes to what's around me." It was inspired by the
Charles Bukowski poem of the same name, which begins "there’s a bluebird in my heart that wants to get out." The parent album's title was lifted from a lyric in the song, which was inspired by a wildcard tattoo Lambert had recently got on her arm memorializing a lyric from "
Easy From Now On", an
Emmylou Harris song that the singer previously covered on her 2007 album,
Crazy Ex-Girlfriend. An acoustic version of the song was also released on June 12, 2020. ==Music video==