sentence: personnel imogen heap -- main performer randy jackson -- bass andy kravitz -- drums abe laboriel jr . -- drums additional personnel david kahne -- producer , engineer , mixing dave stewart -- producer guy sigsworth -- producer nick addison -- engineer phil bodger -- engineer peter norris -- engineer greg calbi -- mastering roland herrington -- mixing dwight marshall -- photography chazz -- photography alex silva -- programming andy wright -- programming itunes festival : london '07 ep on december 11 , 2009 , heap released an itunes exclusive live ep titled '' imogen heap : an evening with i megaphone .