outs , ▁and ▁Simon ▁& ▁Sch uster . ▁ ▁In ▁ 1 9 9 1 , ▁Thomas ▁Wh art on ▁wrote ▁and ▁illustrated ▁the ▁children ' s ▁book ▁H ilde g ard ▁S ings ▁about ▁an ▁opera ▁singing ▁hi ppo ▁who ▁asp ires ▁to ▁be ▁an ▁opera ▁star . ▁ ▁Publish ers ▁Week ly ▁describes ▁the ▁book ▁as ▁a ▁" light heart ed ▁and ▁triumph ant ▁tale " ▁while ▁Kirk us ▁sees ▁it ▁as ▁" an ▁excellent ▁way ▁to ▁introduce ▁k ids ▁to ▁the ▁opera ." ▁ ▁Thomas ▁Wh art on ▁and ▁Robert ▁L owe ▁then ▁established ▁One ▁H undred ▁Rob ots , ▁an ▁iOS ▁application ▁development ▁and ▁publishing ▁company . ▁Their ▁first ▁iOS ▁application , ▁The ▁Night ▁Before ▁Christmas , ▁was ▁released ▁in ▁December ▁ 2 0 1 0 . ▁Their ▁next ▁release , ▁C inder ella ▁- ▁A ▁Princess ▁Story ▁was ▁in ▁April ▁ 2 0 1 1 . ▁H ilde g ard ▁S ings , ▁an ▁adaptation ▁of ▁the ▁original ▁book , ▁which ▁was ▁released ▁as ▁an ▁app ▁for ▁iPhone , ▁i Pad , ▁and ▁i Pod ▁Touch ▁on ▁June ▁ 2 3 , ▁ 2 0 1 1 . ▁ ▁References ▁ ▁External ▁links ▁▁ ▁Thomas ▁Wh art on ▁Studio ▁artist ▁website ▁ ▁One ▁H undred ▁Rob ots ▁website ▁ ▁Advent ure ▁House ▁Communic ations ▁Group ▁website ▁ ▁School ▁Library ▁Journal ▁review ▁of ▁H ilde g ard ▁S ings ▁ ▁The ▁Liter ary ▁Platform ▁review ▁of ▁H ilde g ard ▁S ings ▁ ▁Te ach ers with apps .