[2] In addition to the French-language original version, she recorded the song in English –as "Colours of Love" with lyrics by Bryan Blackburn–,[3] German –as "Blau wie das Meer" with lyrics by Klaus Munro–, Italian –as "L'amore è blu"–, and Dutch –as "Liefde is zacht"–,[1] that were release in nineteen countries.

[4][5] On 8 April 1967, the Eurovision Song Contest was held at the Großer Festsaal der Wiener Hofburg in Vienna hosted by Österreichischer Rundfunk (ORF), and broadcast live throughout the continent.

[6] At the close of voting, It had received 17 points, placing it fourth in a field of seventeen, behind "Il doit faire beau là-bas" (France), "If I Could Choose" (Ireland) and the winning song, "Puppet on a String" (United Kingdom).

[7] It was succeeded as Luxembourgian representative at the 1968 contest by "Nous vivrons d'amour" by Chris Baldo & Sophie Garel.

[18] The song became a number-one hit in the USA for five weeks in February and March 1968, the first recording by a French artist to top the Billboard Hot 100.

Mauriat's version became a gold record, and its five-week run at the top is the second longest of any instrumental of the Hot 100 era, after "Theme from A Summer Place".

The song also spent 11 weeks atop Billboard's Easy Listening survey, and held the longest-lasting title honours on this chart for 25 years.