It is an important example of early Romantic opera.

It is the earliest German opera whose music has survived.

These early operas, however, failed to catch the imagination of the Spanish public.

He is considered a foremost interpreter of early Italian opera.

It was one of the earliest Mexican operas to use a native subject.

Another first, this is the earliest surviving opera written by a woman.

The subject was, as usual in early opera, a classical myth.

And the influence of these earlier operas was to come shining through in Sly.

It is among the earliest American operas to present its subject realistically.

The book is also an important source of information about the performance of early 19th-century opera.