notable opera singers are: placido domingo, luciano pavarotti, joan sutherland, nicolai ghiaurov, maryline horne, maria callas, renee fleming, angela gheorgiu, roberto alagna, and jose carreras
"a form of theatre in which all, or at least most, of the lines are sung rather than spoken
"notable opera singers are: placido domingo, luciano pavarotti, joan sutherland, nicolai ghiaurov, maryline horne, maria callas, renee fleming, angela gheorgiu, roberto alagna, and jose carreras" What is the definition of "opera"?