Direct answer: The phrase “song sung blue” most famously comes from the Neil Diamond song “Song Sung Blue,” which uses a simple, lullaby-like melody to express longing, sadness, and nostalgia in a gentle, reassuring way. The line “Song sung blue” serves as a metaphor for melancholy that is shared or normalized through music, suggesting that singing about sorrow can be a comforting, universal human experience. Context and interpretations

• Original meaning: In Neil Diamond’s lyrics, the chorus describes feeling blue and finding solace in music, implying that singing about sadness can help one cope and feel less alone.

• Common themes: The song often read as a tender ballad about love and longing, using soft imagery and a soothing tempo to convey intimate, personal emotion through a universally accessible form—a sung melody.

• Cultural reception: Over time, “Song Sung Blue” has been discussed both as a classic pop ballad and as a piece illustrating how music can turn personal pain into shared sentiment; interpretations vary with listeners’ own experiences.

If you’re asking about a different “Blue” song or a specific artist’s track titled “Blue,” please specify the artist or provide a lyric snippet, and the meaning can be tailored to that song’s context.