More easily than you would that music!
I dont think that would be too hard since the lighted diabolo is easy to focus on. If he was toss juggling he'd be in worse shape.
I did a performance once in a ropey working mans club on a dance floor about 10 foot square, a ceiling so low that I couldnt do big suns, the crowd was all around me shouting and screaming drunkenly, the cd player couldnt read computer burnt cd's and when I started my routine (to some banging hardcore the DJ kindly chose) the lights came on complete with strobes, panning and flashing colours, laser and smoke machine. everything but the bubbles.
I didnt drop but it wasn't my best performance.
Sean -off to have a lie down to put that memory out of my head