▁a ▁solo ▁cant ata ▁for ▁sop rano ▁and ▁forte p iano ▁composed ▁in ▁ 1 7 8 5 ▁by ▁Antonio ▁Sal ieri ▁and ▁Wolfgang ▁Ama de us ▁Moz art , ▁and ▁a ▁third , ▁unknown ▁composer , ▁Cor net ti , ▁to ▁a ▁libre tto ▁written ▁by ▁the ▁Vienna ▁court ▁poet ▁Lorenzo ▁Da ▁P onte . ▁It ▁is ▁spec ulated ▁that ▁" Cor net ti " ▁may ▁refer ▁to ▁Aless andro ▁Cor net ti , ▁a ▁vocal ▁teacher ▁and ▁composer ▁active ▁in ▁Vienna ▁at ▁the ▁time , ▁or ▁that ▁it ▁is ▁a ▁pseud onym ▁of ▁either ▁Sal ieri ▁or ▁Stephen ▁St or ace , ▁a ▁composer ▁who ▁organized ▁the ▁collabor ative ▁work ▁to ▁honor ▁his ▁famous ▁sister . ▁The ▁music ▁had ▁been ▁considered ▁lost ▁until ▁November ▁ 2 0 1 5 , ▁when ▁German ▁music ologist ▁and ▁composer ▁T imo ▁J ou ko ▁Her rm ann ▁identified ▁the ▁score ▁while ▁searching ▁for ▁music ▁by ▁one ▁of ▁Sal ieri ' s ▁ost ens ible ▁pup ils , ▁Antonio ▁Cas imir ▁Cart el lier i , ▁in ▁the ▁arch ives ▁of ▁the ▁Czech ▁Museum ▁of ▁Music ▁in ▁Prag ue . ▁ ▁History ▁Con ce ived , ▁written ▁and ▁composed ▁to ▁celebr ate ▁the ▁newly ▁recovered ▁health ▁of ▁Nancy ▁St or ace , ▁the ▁Vienna - based , ▁Ang lo - Ital ian ▁sop rano ▁dest ined ▁to ▁become ▁the ▁first ▁Sus anna ▁of ▁Fig aro , ▁and ▁to ▁welcome ▁her ▁back ▁to ▁the ▁stage ▁after ▁a ▁temporary ▁loss ▁of ▁her ▁singing ▁voice ▁ow ing ▁to