"Clair de Lune" is a famous classical piano piece composed by Claude Debussy, a French composer.
Association with Lana Del Rey
The song was featured in Del Rey's 2016 music video for "Freak". Del Rey also used the song as an interlude during her performance at the Orange Warsaw Festival in Warsaw, Poland, on June 3, 2016. It played right after Del Rey performed "Freak".