Look up Le Vent Nous Portera by Noir Desir.

La Scala do a good cover of it too.

Here's a nice video with lyrics of Bons Baisers de Marseille by Moussou T E Lei Jovents: https://youtu.be/4XfvXjcX1x4

Another fan of Christine and the Queens here. Fabulous.

For a bit of retro listening I don't think you can beat Petula Clark's French output from the 60's and 70's - even her "Petula" album from 2013

OP here................thanks so miuch everyone for all the brilliant suggestions. Have started listening to them and there are some real gems in there! So many artists that I otherwise wouldn't have heard of, and some I'd heard of but had forgotten about. It's really helpful.