Written by the French composers André Popp and Pierre Cour, this song was originally Luxembourg's entry in the 1967 Eurovision Song Contest sung by the Greek singer Vicky Leandros. It finished in fourth place.
In 1968, French orchestral leader Paul Mauriat's instrumental version went to #1 in the US, making it the biggest ever seller of a Eurovision Song Contest song in America, and the first US chart topper by a French artist. In the UK it peaked at #12.
This colorful tune is a song of heartbreak, as the singer is blue since she's lost her love, and also green with jealousy. The French version as performed by Vicky Leandros is called "L'amour Est Bleu."
Many other artists have recorded this, including a version by country and western artist Marty Robbins in 1968. That same year, it hit the Hot 100 for three different artists: Al Martino (#57), Claudine Longet (#71) and Manny Kellem (#96).
In 1969, a version by The Dells in a medley with "I Can Sing A Rainbow" reached #22.
Jeff Beck covered this song after he left the Yardbirds, but before he formed the Jeff Beck Group. According to Rolling Stone biography on Beck, he deliberately played it out of tune because he hated the song. His version reached #23 in the UK.