The musical style of Only Girl (in the world) is defined as electronic music, Hi-NRG and R&B; B) and Euro-Pop. The score of the song is composed of F minor, and the rhythm of the song is 126 beats per minute. The main instrument used to make songs is a synthesizer, which constructs a heavy whip bass. Rihanna's singing range is from F? 3 to c? 5. Rihanna's timbre in the song is sonorous and powerful. Songs are full of flirting and teasing fun, and they contain relaxation and freedom, giving people a kind of personality.