What is the best French song ever?
Should've know that you would've know it already. Anyways, here's a playlist containing various French covers of Beatles songs if you're interested :
'Avec le temps' (Léo Ferré): https://www.youtube.com/watch?v=ZH7dG0qyzyg
'Ne me quitte pas' (Jacques Brel): https://www.youtube.com/watch?v=0k63grkip5I
'Je suis malade' (Alice Dona/Serge Lama): https://www.youtube.com/watch?v=isCJAxWtreY
Those three are generally at the top of all lists. Several songs in this thread are just pop trash, to me.
Alice Dona and Serge Lama have never managed to sing their own song well enough. There are some good performances by Dalida and Lara Fabian (https://www.youtube.com/watch?v=dVvlmpo5g9k, with French lyrics and English translation) but it could be better than that. To me, that song is better than it can be sung.