Sandy Julien Wilhelm, better known by his stage name Sandy Vee, is a French music producer, DJ and songwriter. He gained much commercial and critical recognition for co-producing Rihanna's "Only Girl ", Katy Perry's “Firework”, and eight songs on the David Guetta album One Love. He originally played bass in a variety of jazz, rock, and punk bands before gaining exposure to the underground DJ scene in France. He currently resides in New York City.

"Firework" is a song by American singer Katy Perry from her third studio album, Teenage Dream (2010). Perry co-wrote the song with Ester Dean and the song's producers Stargate and Sandy Vee. It is a dance-pop self-empowerment anthem with inspirational lyrics, and Perry felt it was an important song for her on the record. Capitol Records released it as the album's third single on October 26, 2010.