Song Sung Blue is a song.
`` Song Sung Blue '' is a 1972 hit song written and recorded by Neil Diamond , inspired by the second movement of Mozart 's Piano Concerto # 21 . The song was released on Diamond 's album , Moods and later appeared on many of Diamond 's live and compilation albums . The song spent twelve weeks in the Top 40 . The song has become one of Diamond 's standards , and he often performs it during concerts . The song inspired the title of a 2008 documentary about a Neil Diamond impersonator who was married to a Patsy Cline impersonator .