▁ ▁References ▁▁ ▁Category : A cadem ic ▁programming ▁languages ▁Category : Function al ▁languages ▁Category : Dep end ently ▁typed ▁languages ▁Category : Proof ▁assist ants ▁Category : Dis cont in ued ▁programming ▁languages <0x0A> </s> ▁Z den ě k ▁Ot ava ▁( 1 1 ▁March ▁ 1 9 0 2 ▁- ▁ 4 ▁December ▁ 1 9 8 0 ) ▁was ▁a ▁Czech ▁oper atic ▁bar it one ▁who ▁had ▁a ▁length y ▁career ▁at ▁the ▁Prag ue ▁National ▁Theatre ▁that ▁sp anned ▁more ▁than ▁four ▁dec ades . ▁Music ologist ▁Al ena ▁N ě mc ová ▁stated ▁that , ▁" O t ava ' s ▁voice ▁had ▁a ▁very ▁wide ▁vocal ▁range ▁and ▁a ▁marked ▁intensity , ▁and ▁while ▁light , ▁was ▁extremely ▁varied ▁in ▁colour , ▁with ▁an ▁even ▁tone , ▁free ▁of ▁v ibr ato ; ▁his ▁diction ▁was ▁absolutely ▁clear ." ▁In ▁addition ▁to ▁his ▁opera ▁career , ▁he ▁was ▁also ▁a ▁successful ▁rec ital ist , ▁particularly ▁known ▁for ▁his ▁performances ▁of ▁the ▁contemporary ▁Czech ▁re per toire . ▁His ▁voice ▁is ▁preserved ▁on ▁a ▁number ▁of ▁record ings ▁made ▁on ▁the ▁Sup raph on ▁label . ▁ ▁Biography ▁Born ▁in ▁V ít ě je ves , ▁worked ▁as ▁a ▁cho ir boy ▁in ▁Br no ▁where ▁his ▁singing ▁drew ▁the ▁pra ise ▁of ▁Leo š ▁Jan á č ek . ▁In ▁his ▁youth ▁he ▁studied ▁viol in ▁and ▁piano ▁with ▁Boh us lav ▁Martin ů . ▁He ▁initially ▁wanted ▁to ▁become ▁a ▁teacher ▁like ▁his