This swing number features Sara Bareilles. Zac Brown told Tonedeaf.com
: "Sara Bareilles killed it. I love the way she sang it, her voice, and she took time out. She's doing a musical, (Waitress) and so took time out from that to go over to the studio and I was Facetiming her while she was recording at the studio."
He added: "I think she was the perfect person to have on there. (Songwriters) Niko (Moon) and Anna (Harwood) had started or written that song and it was kind of a ukulele-type, like a Jack Johnson-ish type tune, and it was cool like that. It was cool being islandy but I was walking at the beach when we were arranging the record and I was like, 'Man, what if "Mango Tree" was like big band,' like juxtaposition of that with the islandy thing, and it was fun to see a song now that could be like a big wedding song that could be done in coat and tails."