I never heard Carla Bruni but I hope she doesn't have lyrical content that express the visions of her husband.
If you want quality French language music I definitely recommend Indochine to anyone. Not because of their iconic status or because of how important they were for the evolution of alternative rock in the French language, but because their music is simply very good with lyrically great meanings. No coincidence they have a fanbase outside of the francophone world, something few other French artists achieved.
Although somewhat lyrically more nonsensical, this song has been revolutionary in French music:
http://www.youtube.com/watch?v=NJK8aVOUm9o
This was pretty much the first alternative rock song in the French language, in a time when French music was mostly chanson and alternative rock was only coming from cross Channel. Indochine broke that language barrier pretty much on their own by singing in their native French and bringing a type of music people in France were used from only foreign artists.
For more lyrically in-depth songs by Indochine, look up songs such as Marilyn, Comateen I, Le Grand Secret (and no, Comateen I is not in English, apart from the song title it is entirely in French )
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Do what Thou wilt shal be the whole of the Law.
Love is the Law, Love under Will. And...
every man and every woman is a star
(excerpt from The Book of the Law - Aleister Crowley)
"Od lo avda tikvateinu" (excerpt from the Israeli hymn)