"Only Girl (In the World)" is a song by Barbadian singer Rihanna from her fifth album, Loud (2010). The album's lead single, it was released on September 10. Crystal Johnson wrote the song in collaboration with producers Stargate and Sandy Vee. Rihanna contacted Stargate before Loud's production and asked them to create lively, uptempo music. "Only Girl (In the World)" was the first song composed for the album, and the singer decided to include it on the track list before she recorded her vocals. Backed by strong bass and synthesizer, it is a eurodance song that incorporates elements of hi-NRG, rave and R&B in its composition. In its lyrics, Rihanna demands physical attention from her lover.