Whilst looking for something else this evening, I came across the Eurovision song contest of 1967. It was at this event that singer Vicky Leandros, representing Greece, first presented 'L'Amour Est Bleu', ('Love Is Blue'). There's a recording on YouTube of her Eurovision performance, but its soundtrack isn't very good quality, so I've chosen to use this one instead. (The French lyrics, with an English translation, may be found here.)
The song was popularized in the USA in an instrumental version by Paul Mauriat and his orchestra. To date it's the only piece by a French artist to hit No. 1 on the Billboard Hot 100 (in 1968).
I was still a child then, but I remember both versions. Lots of nostalgia there . . .