"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. It was released on Diamond's album Moods, and later appeared on many of Diamond's live and compilation albums. The song was a #1 hit on the Billboard Hot 100 chart in the United States for one week, the week of July 1, and it spent twelve weeks in the Top 40. It also reached #14 on the UK Singles Chart.

"Song Sung Blue" was Diamond's second #1 hit in the U.S., after 1970's "Cracklin' Rosie", and to date his last solo #1 song (he had a #1 duet with Barbra Streisand in 1978, with "You Don't Bring Me Flowers"). In addition, "Song Sung Blue" spent seven weeks at #1 on the adult contemporary chart. The song has become one of Diamond's standards, and he often performs it during concerts.

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