. ▁A ▁more ▁recent ▁example ▁of ▁a ▁pro lation ▁canon ▁in ▁contemporary ▁music ▁is ▁r inden mot ette ▁( 2 0 1 1 ) ▁by ▁Aust rian ▁composer ▁Klaus ▁Lang . ▁ ▁In ▁this ▁example , ▁the ▁first ▁ 1 2 ▁bars ▁of ▁the ▁Ag n us ▁De i ▁II ▁of ▁the ▁earlier ▁of ▁the ▁two ▁masses ▁Jos quin ▁wrote ▁based ▁on ▁the ▁L ' homme ▁arm é ▁t une , ▁each ▁voice ▁s ings ▁the ▁same ▁music , ▁but ▁at ▁different ▁spe eds . ▁ ▁The ▁top ▁voice ▁is ▁bar red ▁in ▁ 3 / 4 ▁meter ▁for ▁clar ity . ▁ ▁The ▁slow est ▁voice ▁is ▁the ▁one ▁in ▁the ▁middle . ▁The ▁lowest ▁voice ▁s ings ▁the ▁same ▁music ▁at ▁twice ▁the ▁speed ▁of ▁the ▁slow est , ▁and ▁the ▁highest ▁voice ▁s ings ▁the ▁same ▁music ▁at ▁three ▁times ▁the ▁speed ▁of ▁the ▁slow est . ▁ ▁In ▁the ▁original ▁score , ▁only ▁one ▁part ▁is ▁given : ▁a ▁notation ▁over ▁the ▁single ▁line ▁of ▁music ▁indicates ▁the ▁three ▁pro l ations ▁to ▁be ▁used , ▁and ▁a ▁second ▁notation ▁over ▁the ▁line ▁indicates ▁where ▁each ▁voice ▁should ▁end ▁if ▁s ung ▁correctly . ▁ ▁References ▁ ▁Article ▁" Can on ," ▁The ▁New ▁Gro ve ▁Dictionary ▁of ▁Music ▁and ▁Mus icians , ▁ed . ▁Stanley ▁Sad ie . ▁▁ 2 0 ▁vol . ▁ ▁London , ▁Mac mill an ▁Publish ers ▁Ltd ., ▁ 1 9 8 0 . ▁▁▁ ▁Harvard ▁Anth ology ▁of ▁Music . ▁ ▁Two