▁the ▁seven - year - old ▁appeared ▁in ▁Car neg ie ▁Hall , ▁conduct ing ▁the ▁Sym phony ▁of ▁the ▁Air . ▁ ▁The ▁am bit ious ▁program ▁included ▁two ▁over t ures , ▁Moz art ' s ▁The ▁Mar riage ▁of ▁Fig aro ▁and ▁Ross ini ' s ▁William ▁Tell , ▁as ▁well ▁as ▁Hay dn ' s ▁" Sur prise " ▁Sym phony ▁and ▁Be eth oven ' s ▁ 5 th ▁Sym phony . ▁ ▁At ▁the ▁age ▁of ▁eight , ▁on ▁November ▁ 1 7 , ▁ 1 9 5 7 , ▁he ▁was ▁a ▁guest ▁on ▁the ▁American ▁TV ▁game - show ▁What ' s ▁My ▁Line ?. ▁He ▁also ▁appeared ▁on ▁I ' ve ▁Got ▁a ▁Secret , ▁where ▁he ▁performed ▁on ▁four ▁different ▁instruments . ▁ ▁Further ▁appearances ▁in ▁New ▁York ▁with ▁the ▁Sym phony ▁of ▁the ▁Air ▁followed ▁in ▁ 1 9 5 7 , ▁ 1 9 5 8 , ▁and ▁ 1 9 6 0 , ▁and ▁Jo ey ▁conducted ▁in ▁many ▁other ▁American ▁cities ▁and ▁tou red ▁Europe . ▁ ▁He ▁attended ▁re he ars als ▁and ▁concert s ▁led ▁by ▁Leopold ▁Sto kow ski , ▁Gu ido ▁Cant elli , ▁Pierre ▁Monte ux , ▁Sir ▁Thomas ▁Be ech am , ▁and ▁Leonard ▁Bern stein . ▁ ▁He ▁was ▁invited ▁to ▁the ▁V at ican ▁where ▁he ▁performed ▁for ▁Pope ▁John ▁XX III , ▁who ▁said ▁the ▁boy ▁might ▁turn ▁out ▁to ▁be ▁" another ▁Moz art ". ▁ ▁Jo ey ▁continued