Jazz-pop crossover act Jamie Cullum announced himself in self-deprecating style on early albums Heard It All Before and Pointless Nostalgic. But his shrewdly crafted and heartfelt reinventions of Hendrix, Ellington and Sinatra begged to differ as he hit the talk-show piano on every continent on Earth. From classic Elton John to a Roots Manuva cameo, here's the best of what slipped under the radar.