It was a three-act opera rather than a standard five-act opera as laid down by Meyerbeer.

Berg completed the orchestration of only the first two acts of his later three-act opera Lulu, before he died.

A three-act opera, written in 1823 but not staged until 1897.

Although the musical numbers were still linked by dialogue, the first act had been divided in two, to create a three-act opera.

The three-act opera played the New Amsterdam Theatre for the first time on October 21.

The three-act opera was presented at Lincoln Center last September.

It was revised as a three-act opera in 1898, and a prelude was added in 1937.

His three-act opera Brunelleschi has never yet been performed.

The first time it was performed (in 1805) it was a three-act opera called Leonore.

What we're planning in four weeks' time is to put on a three-act opera with the whole of Washington as our invited audience.