▁of ▁Sc ots ▁( 1 9 7 7 ) ▁A ▁Christmas ▁Carol ▁( 1 9 7 9 ) ▁An ▁Occ urrence ▁at ▁O w l ▁Creek ▁Bridge ▁( 1 9 8 1 ) ▁Har ri et , ▁the ▁Woman ▁called ▁' M oses ▁( 1 9 8 4 ) ▁Sim ón ▁Bol í var ▁( 1 9 9 2 ) ▁Pont al ba ▁( 2 0 0 3 ) ▁ ▁The ▁composer ▁and ▁controvers ial ist , ▁James ▁Mac Mill an ▁has ▁also ▁written ▁several ▁oper as ▁– ▁In és ▁de ▁Castro ▁( li bre tto : ▁John ▁Cl iff ord ▁– ▁ 1 9 9 1 – 9 5 ), ▁The ▁Sac rifice ▁( opera ) ▁and ▁Cle men cy . ▁ ▁The ▁Scottish ▁composer ▁Julian ▁W ag st aff ▁has ▁written ▁and ▁produced ▁two ▁chamber ▁oper as ▁informed ▁by ▁scientific ▁subject ▁matter , ▁namely ▁The ▁T uring ▁Test ▁( 2 0 0 7 ) ▁ ▁and ▁Bre at he ▁Fre ely ▁( 2 0 1 3 ), ▁the ▁latter ▁produced ▁with ▁the ▁support ▁of ▁Scottish ▁Opera . ▁ ▁More ▁recent ▁oper as ▁have ▁t ended ▁to ▁be ▁sh aped ▁in ▁one ▁act , ▁but ▁the ▁libre tt ists ▁have ▁often ▁been ▁more ▁notable ▁than ▁the ▁compos ers . ▁Among st ▁these ▁are ▁Louise ▁Wel sh , ▁Zo ë ▁Stra chan , ▁Arm ando ▁Ian ucci ▁and ▁A ong has ▁Mac Ne ac ail . ▁Jane ▁An nie ▁is ▁an ▁earlier ▁example ▁of ▁this ▁phenomen on . ▁▁ ▁Stuart ▁Mac R ae