This month, Imogen Heap
is wrapping up the North American end of her Ellipse World Tour
with some celeb-gone-good flavor! The artist behind Jason Derulo's "Whatcha Say" vocals has set the goal of raising $54,000 for charity while she's at it. Her creative tactic? To improvise on the spot and perform the musical piece right then and there at each of her concerts. It gets better! Imogen Heap wants the audience to be involved in ...