▁first ▁director . ▁ ▁After ▁cr ushing ▁of ▁the ▁Prag ue ▁Spring ▁movement ▁in ▁ 1 9 6 8 ▁his ▁art istic ▁work ▁was ▁b anned . ▁However , ▁he ▁managed ▁to ▁secure ▁the ▁position ▁of ▁professor ▁at ▁the ▁Jan ▁De yl ▁Conserv atory ▁and ▁Second ary ▁school ▁for ▁Vis ually ▁Imp a ired . ▁Later ▁on ▁he ▁moved ▁to ▁the ▁Prag ue ▁Conserv atory , ▁where ▁he ▁taught ▁music ▁theory ▁and ▁composition ▁from ▁ 1 9 7 6 ▁to ▁ 1 9 9 2 . ▁At ▁present , ▁he ▁pres ides ▁over ▁the ▁administrative ▁board ▁of ▁D ilia , ▁an ▁international ▁ag ency ▁providing ▁copy right ▁protection . ▁ ▁An ▁aw arde e ▁of ▁the ▁ 2 0 0 3 ▁Sup raph on ▁Gold ▁and ▁Pl atin um ▁Disc , ▁Pet rov ▁has ▁composed ▁nearly ▁ 1 3 0 0 ▁works , ▁concentr ating ▁in ▁his ▁production ▁mainly ▁on ▁theatre , ▁film , ▁radio , ▁and ▁television ▁music . ▁Besides ▁that , ▁he ▁is ▁the ▁author ▁of ▁tradition ally ▁conce ived ▁orch est ral ▁and ▁chamber ▁compos itions , ▁the ▁so - called ▁" e asy ▁listening ", ▁ch oral ▁works , ▁songs , ▁popular ▁ch ans ons , ▁or ▁music ▁for ▁pro se ▁and ▁poetry ▁rec itation . ▁ ▁His ▁grand d augh ter ▁is ▁model ▁L inda ▁V oj to vá . ▁ ▁Mov ies ▁ ▁Tob og an ▁( 1 9 8 9 ) ▁ ▁Sed mé ▁ne be ▁( 1 9 8 7 ) ▁ ▁Ú sm ě