▁har sh er ▁still , ▁accur ately ▁ident ifying ▁the ▁piece ▁as ▁a ▁far ce ▁d ' atel ier ▁( studio ▁pr ank ) ▁with ▁" no ▁possible ▁claim ▁to ▁be ▁considered ▁as ▁music ", ▁and ▁character ising ▁the ▁BBC ' s ▁broadcast ▁of ▁such ▁a ▁thing ▁" a ▁serious ▁error ▁of ▁judgment ". ▁My ers ▁continued , ▁ ▁He ▁concluded ▁with ▁pra ise ▁for ▁the ▁other ▁works ▁on ▁the ▁programme , ▁by ▁We bern , ▁N ono , ▁Pet rass i , ▁and ▁" the ▁always ▁satisfying ▁Ser en ade ▁in ▁B ▁flat ▁for ▁th ir teen ▁wind ▁instruments ▁by ▁Moz art — which ▁may ▁have ▁been ▁missed ▁by ▁the ▁many ▁listen ers ▁who , ▁I ▁am ▁sure , ▁switched ▁off ▁their ▁sets ▁for ▁the ▁repeat ▁performance ▁of ▁the ▁Zak ". ▁ ▁Ad mission ▁of ▁ho ax ▁Near ly ▁two ▁months ▁after ▁the ▁event , ▁a ▁BBC ▁sp okes man ▁denied ▁that ▁the ▁work ▁was ▁a ▁ho ax , ▁describing ▁it ▁instead ▁as ▁an ▁" ex periment ", ▁in ▁which ▁" the ▁per cussion ▁instruments ▁on ▁the ▁t ape ▁were ▁played ▁at ▁random . ▁I ▁imagine ▁that ▁Pi otr ▁Zak ▁does ▁not ▁exist . ▁But ▁we ▁did ▁not ▁ho ax ▁the ▁listen ers . ▁It ▁was ▁an ▁experiment ". ▁A ▁conflic ting ▁report ▁published ▁the ▁next ▁day ▁claimed ▁that ▁the ▁BBC ▁conf essed ▁the ▁entire ▁programme ▁had ▁been ▁a ▁ho ax . ▁It ▁was ▁revealed ▁that ▁the ▁piece ▁had ▁been ▁produced ▁by ▁Hans ▁K eller ▁and ▁Susan ▁Brad sh aw ▁at ▁the