, ▁Lav rov sky ▁was ▁also ▁a ▁member ▁of ▁the ▁Mol odo y ▁Bal let ▁( You ng ▁Bal let ), ▁an ▁experimental ▁dance ▁collect ive ▁whose ▁members ▁included ▁the ▁young ▁George ▁Bal anch ine . ▁Lav rov sky ▁performed ▁in ▁F y odor ▁L op uk hov ' s ▁Dance ▁Sym phony ▁along ▁with ▁Bal anch ine , ▁Alex andra ▁Dan il ova , ▁and ▁L idia ▁Ivan ova . ▁ ▁Lav rov sky ' s ▁first ▁major ▁work ▁as ▁a ▁ch ore ograph er ▁was ▁the ▁bal let ▁K ater ina , ▁which ▁he ▁created ▁for ▁a ▁gradu ation ▁performance . ▁The ▁bal let ▁told ▁the ▁story ▁of ▁a ▁ser f ▁the ater , ▁and ▁was ▁ch ore ograph ed ▁to ▁music ▁by ▁Anton ▁Rub in stein ▁and ▁Ad ol phe ▁Adam . ▁In ▁the ▁late ▁ 1 9 3 0 s , ▁Lav rov sky ▁was ▁made ▁the ▁art istic ▁director ▁of ▁the ▁bal let ▁tr oupe ▁of ▁the ▁K iro v ▁Theater . ▁ ▁Rome o ▁and ▁Jul iet ▁In ▁ 1 9 3 8 , ▁the ▁K iro v ▁Theater ▁agreed ▁to ▁stage ▁Serge i ▁Pro k of iev ' s ▁Rome o ▁and ▁Jul iet . ▁Lav rov sky ▁and ▁Pro k of iev ▁strugg led ▁for ▁a ▁period ▁over ▁the ▁score ▁and ▁libre tto , ▁Lav rov sky ▁eventually ▁persu ading ▁the ▁composer ▁to ▁add ▁variations ▁for ▁Rome o ▁and ▁Jul iet ▁as ▁well ▁as ▁some ▁other ▁incident al ▁numbers . ▁The ▁bal let ▁premier ed