▁Ross ini ' s ▁contract ▁required ▁him ▁to ▁provide ▁five ▁new ▁works ▁for ▁the ▁Op éra ▁over ▁ 1 0 ▁years . ▁After ▁the ▁première ▁of ▁Tell ▁he ▁was ▁already ▁considering ▁some ▁opera ▁subjects , ▁including ▁Go ethe ' s ▁Fa ust , ▁but ▁the ▁only ▁significant ▁works ▁he ▁completed ▁before ▁abandon ing ▁Paris ▁in ▁ 1 8 3 6 ▁were ▁the ▁St ab at ▁M ater , ▁written ▁for ▁a ▁private ▁commission ▁in ▁ 1 8 3 1 ▁( l ater ▁completed ▁and ▁published ▁in ▁ 1 8 4 1 ), ▁and ▁the ▁collection ▁of ▁sal on ▁vocal ▁music ▁So ir ées ▁musical es ▁published ▁in ▁ 1 8 3 5 . ▁Living ▁in ▁Bolog na , ▁he ▁occupied ▁himself ▁teaching ▁singing ▁at ▁the ▁L ice o ▁Music ale , ▁and ▁also ▁created ▁a ▁past ic cio ▁of ▁Tell , ▁Rod ol fo ▁di ▁Ster ling a , ▁for ▁the ▁benefit ▁of ▁the ▁singer ▁Nikol ay ▁Ivan ov , ▁for ▁which ▁Giuseppe ▁Ver di ▁provided ▁some ▁new ▁a rias . ▁Cont inu ing ▁demand ▁in ▁Paris ▁resulted ▁in ▁the ▁produ ctions ▁of ▁a ▁" new " ▁French ▁version ▁of ▁Ot ello ▁in ▁ 1 8 4 4 ▁( with ▁which ▁Ross ini ▁was ▁not ▁involved ) ▁and ▁a ▁" new " ▁opera ▁Robert ▁Bruce ▁for ▁which ▁Ross ini ▁co oper ated ▁with ▁Louis ▁Nied erm ey er ▁and ▁others ▁to ▁rec ast ▁music ▁for ▁La ▁donna ▁del ▁l ago ▁and ▁others ▁of ▁his ▁works ▁which ▁were ▁little - known ▁in ▁Paris ▁to