useless trivia: What Word Means: A Unit Of Weight In Poland?

Questions

- Abbreviation of Latin opus, work. Used as a publishers' catalogue system to indicate the order in which a composer's works have been published. The higher the opus number, the later the music was published in a composer's lifetime.?

- A drama in which all or most characters sing and in which music is an important element. Early composers of opera include Monteverdi and Purcell. Other composers are Mozart, Beethoven, Rossini, Donizetti, Verdi, Wagner (who preferred the term music drama), Puccini, and in the 20th century, Berg and Britten.?

(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).?