I'm not sure if 'Pourquoi je chante' is a direct dig at Sylvie's song, but maybe someone can enlighten me. But it sounds like it might be, when you compare Sylvie's "If I sing, it's for you" to Stella's "If I sing, it's not for you, not for him, not for me... it's for the money, for the dough".
My uncle and I poked fun at the French yé-yé songs - we thought they were more funny than serious. So we started writing songs to capture that irony.
Thought I'd mention that the amazing track from Spiked Candy Canes, Marlene Paula's 'I Wanna Spend Christmas with Elvis' is from the compilation Rockabilly Christmas, which features all original 50s rockabilly songs, and can be bought here.