KSI

As his hit "Keep Up" explains, U.K. entertainer and MC KSI has a "book, a movie, a Lamborghini, and a song about a Lamborghini." Born Olajide Olatunji, KSI was known as KSIOlajideBT in 2008 when he became a regular video game commentator, uploading his videos to the Web, most of them focused on the FIFA series. It was a footballer who inspired him to try his hand at rap as Emile Heskey was the topic of "Heskey Time," a satirical rap that kicked off a series of football-mocking songs, including 2012's "Sweaty Goals" with Randolph. In 2013 he joined rapper Sway on his single "No...