a song. For the final four weeks of the year, the top spot was occupied by Christmas songs, reflecting the general trend in the music played on adult contemporary radio stations in December of each year. John Legend spent three weeks at number one with his version of the 1940s song "Have Yourself a Merry Little Christmas", featuring jazz bassist Esperanza Spalding, before Katy Perry spent the final week of the year atop the chart with "Cozy Little Christmas". Chart See also 2018 in American music References 2018 Number-one adult contemporary singles United States Adult Contemporary