From the blackness of a darkened stage, the spotlight is on the drummer, bare -chested, hands in air, ready to beat his tom-toms with the undulations of a driving piston. It is dark and quiet, but he is coiled to explode. Thus begins Sound of Metal, a film now on Amazon Prime that dares to explore deafness with fury and anger and contradictions. Riz Ahmed, so good in the 2016 HBO limited series The Night Of ..., plays the hard-rock drummer at the heart of the film as a man en