A Sevdah Opera - Vocal Score-Vocal score for Differences In Demolition A Sevdah Opera by Nigel Osborne. For soprano or high mezzo mezzo soprano tenor and 2 baritones with orchestra of clarinet in Bb (doubling clar in Eb & bass clar inBb) percussion accordion machines 1 & 2 violin viola cello.World premiere: Opera Circus dir. Lenka Udovicki produced by Tina Ellen-Lee 9th June 2007 National Theatre Mostar Bosnia & Herzegovina.