Blue Moon is a song by Richard Rodgers and Lorenz Hart in 1934. It became a popular ballad (民谣) and over 60 artists have covered (翻唱) it. Many of them are very famous, for example, The Beatles, Elvis Presley and Bob Dylan. The song has also served as the fan anthem (队歌) for the Premier League football club Manchester City since the 1980s. Fans wear the club’s classic blue shirt and sing this song to show their support and loyalty (忠诚).