Jamie Cullum

This British jazz prodigy is the creator of the jazz album that's sold the most copies ever: 'Twentysomething' (released in 2003 when he was just 24), which shows that virtuosity doesn't have to be at odds with commercial success, and that jazz can work perfectly well with pop and rock melodies, as evidenced by Cullum's versions of Rihanna and White Stripes hits.