Though it was the closing track of Kacey Musgraves’ 2018 instant classic Golden Hour, “Rainbow” has earned its place topping the year-end edition of Today’s Country, which looks back on 2019’s most important tracks from the heart of the country scene to its outer edges. The song is a serene masterwork that incorporates singer-songwriter vulnerability and glistening electronic textures into Musgraves’ country cleverness and camp. Despite an utter lack of radio support at a time when women face towering barriers to success in the country mainstream, with an Album of the Year Grammy win in early 2019, the album generated steady buzz that grew into a genre-transcending popular embrace. The broader appeal of Musgraves’ music was undeniable, and fans held her sentimental piano ballad “Rainbow,” with its wispy tunefulness and tender reassurances, especially dear. Check back early and often for updates in 2020, and if you hear something you like, add it to your library.