 Rihanna 's recording sessions took place at Sun Studios in Dublin , Ireland . Marcos Tovar mixed her vocals , which were engineered by Spike Lindsey and mastered from Detroit over the Internet . The American songwriter Makeba Riddick provided additional vocal production . Strange used equalization , compression and reverberation but left the vocal balance . He assumed that Rihanna was satisfied with her recorded vocals and did not make major changes on her seven stereo vocal tracks . 
