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 "N'écoute 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 Eurovision Song Contest 1965. Inspired by the 4th movement (Prestissimo in F minor) from Beethoven's "Piano Sonata No. 1", the song featured double entendres and wordplay, a staple of Gainsbourg's lyrics. The controversially risqué "Les sucettes" ("Lollipops"), featured references to oral sex, unbeknownst to the 18-year-old Gall, who thought the song was about lollipops. Gall later expressed displeasure at Gainsbourg's antics, stating she felt "betrayed by the adults around me" in 2001. Gainsbourg married a second time on 7 January 1964, to Françoise-Antoinette "Béatrice" Pancrazzi, with whom he had two children: a daughter named Natacha (b. 8 August 1964) and a son, Paul (born in spring 1968). He divorced Béatrice in February 1966.