6. M.I.A., Kala
It may lack the revelatory force of her debut, and it doesn't exactly shine light on her famously slippery politics, but M.I.A.'s Arular follow-up contains enough head-scratching WTF moments to make it one of the year's most engagingly anarchic releases. A song about bird flu? A guest appearance by Timbaland? A guest appearance by a group of preadolescent aboriginal Australian rappers? Covers of the Pixies and the Modern Lovers? Sure, why not.
Listen: M.I.A., "