 Complete the following phrase:  Despite initially mocking yé-yé, a style of French pop typically sang by young female singers, Gainsbourg would soon become of its most important figures after writing a string of hits for artists like Brigitte Bardot, Petula Clark and France Gall. He had met Gall after being introduced by a friend as they were Philips Records labelmates, thus beginning a successful collaboration that would produce hits like Nécoute pas les idoles, the frequently covered Laisse tomber les filles and Poupée de cire, poupée de son, the latter of which was the Luxembourgian winning entry at the 