Rihanna exploded into American music in 2005 with Pon de Replay, the superhit single from her debut album Music of the Sun. At this early stage, AllMusic's critics thought it safe to rate her as someone who fuses Caribbean beats with the urban dance-pop, and is also influenced greatly by dancehall, pop rock and reggae.
The success of Pon de Replay was repeated with the singles SOS, Unfaithful and Break it Off from A Girl Like Me(2006), Rihanna's second album which managed to avoid the second album slump astonishingly well. The young artist, merely 18 years old, was making waves in the music industry. The album reached the 5th slot on Billboard 200, selling a massive 115000 copies in the week after its release, nearly doubling the considerable sales of Music of the Sun which had sold 69000. Critics reported that Rihanna was maturing and incorporating more urban and popular influences into her music, as well as the dark tones that emerge most beautifully in Unfaithful, where the singer compares adultery in relationships to murder.