Recent research has failed to locate these opera scores at the Manoel Theatre archives.
Mr. Gonzalez's music deliberately calls to mind familiar 18th-century- and 19th-century comic opera scores.
It is considered Moniuszko's best opera, and also the greatest among all 19th century Polish opera scores.
"It's one of the most fabulous opera scores I have ever studied," he said.
A later work by Peri, Euridice, dating from 1600, is the first opera score to have survived to the present day.
Corri was given the task of arranging the opera scores for the Old Vic's tiny orchestra.
Günther von Schwarzburg was the first full German opera score to come off a printing press.
She wants things in a wide range, opera scores, Bellini songs, Chopin for the accompanist.
Highly formalized chamber music, possibly, or thunder-and-lightning opera scores.
Then he threw away the opera score and stared blankly into space for a moment.