Umbrella did not make Rihanna's career! It was just a big year for her. Music of the Sun had already sold over 2 million WW before Umbrella was released and certified Gold in the US. A Girl Like Me was a platinum album in the US, Canada, and the UK prior to Umbrella. Break it off was a top 10 hit in the United States without a video or major promo. Teirra recorded crappy songs during her stint with Def Jam. Had she fought for smashes like Rihanna did she would be more successful. I highly doubt she would be as big as Rihanna though, as her appeal is more in the Ashanti, Aaliyah, Ciara lane and not Beyonce, Rihanna-ish. Beyonce although is urban she comes off mainstream by looks and demeanor and Rihanna is a special case. She smokes, drinks, curses like a sailor and for some reason she just doesn't come off as ghetto. I don't know how she can make her antics appear rebellious and not ghetto. How can she be so hood but be so fuckin pop?