With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Opera incorporates masks.
text_B: Opera -LRB- -LSB- ˈɔːpera -RSB- ; English plural  : operas ; Italian plural  : opere -LSB- ˈɔːpere -RSB- -RRB- is an art form in which singers and musicians perform a dramatic work combining text -LRB- libretto -RRB- and musical score , usually in a theatrical setting .. art form. Performing arts. libretto. libretto. musical score. Sheet music. setting. Set construction. In traditional opera , singers do two types of singing  : recitative , a speech-inflected style and arias , a more melodic style , in which notes are sung in a sustained fashion .. recitative. recitative. Opera incorporates many of the elements of spoken theatre , such as acting , scenery , and costumes and sometimes includes dance .. theatre. theatre. acting. acting. scenery. Theatrical scenery. dance. dance. The performance is typically given in an opera house , accompanied by an orchestra or smaller musical ensemble , which since the early 19th century has been led by a conductor .. opera house. opera house. orchestra. orchestra. musical ensemble. musical ensemble. conductor. conducting. Opera is a key part of the Western classical music tradition .. Western classical music. Western classical music. It started in Italy at the end of the 16th century -LRB- with Jacopo Peri 's mostly lost Dafne , produced in Florence in 1598 -RRB- and soon spread through the rest of Europe  : Heinrich Schutz in Germany , Jean-Baptiste Lully in France , and Henry Purcell in England all helped to establish their national traditions in the 17th century .. Jacopo Peri. Jacopo Peri. Dafne. Dafne. Florence. Florence. Heinrich Schutz. Heinrich Schutz. Jean-Baptiste Lully. Jean-Baptiste Lully. Henry Purcell. Henry Purcell. In the 18th century , Italian opera continued to dominate most of Europe -LRB- except France -RRB- , attracting foreign composers such as George Frideric Handel .. George Frideric Handel. George Frideric Handel. Opera seria was the most prestigious form of Italian opera , until Christoph Willibald Gluck reacted against its artificiality with his `` reform '' operas in the 1760s .. Opera seria. Opera seria. Christoph Willibald Gluck. Christoph Willibald Gluck. In the 2000s , the most renowned figure of late 18th-century opera is Wolfgang Amadeus Mozart , who began with opera seria but is most famous for his Italian comic operas , especially The Marriage of Figaro -LRB- Le nozze di Figaro -RRB- , Don Giovanni , and Cosi fan tutte , as well as The Magic Flute -LRB- Die Zauberflote -RRB- , a landmark in the German tradition .. Wolfgang Amadeus Mozart. Wolfgang Amadeus Mozart. The Marriage of Figaro. The Marriage of Figaro. Don Giovanni. Don Giovanni. Cosi fan tutte. Cosi fan tutte. The Magic Flute. The Magic Flute. The first third of the 19th century saw the high point of the bel canto style , with Gioachino Rossini , Gaetano Donizetti and Vincenzo Bellini all creating works that are still performed .. bel canto. bel canto. Gioachino Rossini. Gioachino Rossini. Gaetano Donizetti. Gaetano Donizetti. Vincenzo Bellini. Vincenzo Bellini. It also saw the advent of Grand Opera typified by the works of Auber and Meyerbeer .. Grand Opera. Grand Opera. Meyerbeer. Giacomo Meyerbeer. The mid-to-late 19th century was a `` golden age '' of opera , led and dominated by Richard Wagner in Germany and Giuseppe Verdi in Italy .. Richard Wagner. Richard Wagner. Giuseppe Verdi. Giuseppe Verdi. The popularity of opera continued through the verismo era in Italy and contemporary French opera through to Giacomo Puccini and Richard Strauss in the early 20th century .. verismo. verismo. French opera. French opera. Giacomo Puccini. Giacomo Puccini. Richard Strauss. Richard Strauss. During the 19th century , parallel operatic traditions emerged in central and eastern Europe , particularly in Russia and Bohemia .. Russia. Russian opera. Bohemia. Bohemia. The 20th century saw many experiments with modern styles , such as atonality and serialism -LRB- Arnold Schoenberg and Alban Berg -RRB- , Neoclassicism -LRB- Igor Stravinsky -RRB- , and Minimalism -LRB- Philip Glass and John Adams -RRB- .. atonality. atonality. serialism. serialism. Arnold Schoenberg. Arnold Schoenberg. Alban Berg. Alban Berg. Neoclassicism. Neoclassicism. Igor Stravinsky. Igor Stravinsky. Minimalism. Minimalism. Philip Glass. Philip Glass. John Adams. John Adams ( composer ). With the rise of recording technology , singers such as Enrico Caruso and Maria Callas became known to much wider audiences that went beyond the circle of opera fans .. recording technology. sound recording. Enrico Caruso. Enrico Caruso. Maria Callas. Maria Callas. Since the invention of radio and television , operas were also performed on -LRB- and written for -RRB- these mediums .. Beginning in 2006 , a number of major opera houses began to present live high-definition video transmissions of their performances in cinemas all over the world .. high-definition video. high-definition video. cinemas. Movie theatre. In 2009 , an opera company offered an online download of a complete performance .
related.