A drama, either tragic or comic, of which music forms an essential part; a drama wholly or mostly sung, consisting of recitative, arials, choruses, duets, trios, etc., with orchestral accompaniment, preludes, and interludes, together with appropriate costumes, scenery, and action; a lyric drama.
The score of a musical drama, either written or in print; a play set to music.
An opera begins long before the curtain goes up and ends long after it has come down. It starts in my imagination, it becomes my life, and it stays part of my life long after I've left the opera house. Maria Callas
My horizon on humanity is enlarged by reading the writers of poems, seeing a painting, listening to some music, some opera, which has nothing at all to do with a volatile human condition or struggle or whatever. It enriches me as a human being. Wole Soyinka