Because drama describes opera.
A musical drama is an opera.
Melodrama or Opera .
A public place for shows is called a theater. Modern theaters cater for opera, comedy, musicals, drama, improvisation and tragedy.
Production Drama is drama within a production of some sort, for example a musical or an Opera.
I wouldn't refer to Greys Anatomy as a sitcom, although there is humor involved in the show. I would call the show something like Medical drama, Romance, Soap opera, Comedy-drama.
in a drama, you are acting not funny and immature In a comedy you are acting funny and happy.
no om shanti om is a mix of comedy and drama. but mostly drama (with suspicion)
Comedy and Action
Opera
Music Drama
Italian operas are either opera buffa or opera seria. opera buffa is a comedy. opera seria is a drama. Italian operas often have Bel canto. it means beautiful singing. all i know for German operas are that its very emotional. its not always beautiful, it may sound ugly. sorry that's all i know for Germany. hope that helps.