Terms: A vertical line used to join two or more staves?

Questions

(Fr.) - A light, often satirical opera or operetta (e.g. by Offenbach).?

(It.) - A comic opera especially in the 18th century (e.g. by Pergolesi).?

(Fr.) - This term describes comic opera but has two special meanings: (1) A type of French comic opera with spoken dialogue, lighter than current serious operas in the 18th century; (2) An opera, comic or otherwise, with spoken dialogue (e.g. Bizet's Carmen in the l9th century).?

(It.) - Serious opera and opposite of opera buffa. This term is especially applied to the flourishing 18th century style as used by Rossini. Characterised by the use of castrato singers, heroic or mythological plots, Italian libretti and formality in the music and action.?

- A stage work giving more or less equal importance to opera and ballet (e.g. the works of Lully and Rameau in France in the 17th and 18th centuries).?