A new drama " The Endz " will see pupils from Harris Academy Peckham collaborating with The Multi-Story Orchestra to give a voice to victims of knife crime It is three hours after the end of school on a Friday evening and deep in the bowels of Harris Academy Peckham, south-east London, 20 year 10 students are singing, rapping and dancing in a blacked-out rehearsal room. Their music sounds like an acoustic rendering o…