Nico - Strip-Tease (written by Serge Gainsbourg, via Le Cinéma de Serge Gainsbourg: Musiques de Films 1959-1990) Fellow French language illiterates can find an English translation here.

Strip-Tease is the first song Nico ever recorded. It was written by Gainsbourg for Jacques Poitrenaud’s 1963 film Strip-Tease, in which Nico starred.

Brigitte Bardot - Harley Davidson (written by Serge Gainsbourg) (English lyrics here)

Anna Karina - Sous le Soleil Exactement (written by Serge Gainsbourg) (English translation)

Serge Gainsbourg & Brigitte Bardot - Bonnie and Clyde

English translation here. 

Brigitte Bardot - Un Jour Comme Un Autre (written by Serge Gainsbourg)

Anna Karina - Un Jour Comme Un Autre (Anna: Original Motion Picture Soundtrack)

Written by Serge Gainsbourg. English translation here.