In the late 12th-century, a school of polyphony was established at the Notre-Dame. A group of Parisian aristocrats, known as Trouvères, became known for their poetry and songs. Troubadors were also popular. During the reign of Francois I, the lute became popular in the French court, and a national musical printing house was established. During the Renaissance era, the French Boleroroyals "disported themselves in masques, ballets, allegorical dances, recitals, and opera and comedy". Baroque-era composers include Jean-Baptiste Lully, Jean-Philippe Rameau, and François Couperin and were popular. The Conservatoire de Musique de Paris was founded in 1795. By 1870, Paris had become an important centre for symphony, ballet and operatic music. Romantic-era composers (in Paris) include Hector Berlioz (La Symphonie fantastique), Charles Gounod (Faust), Camille Saint-Saëns (Samson et Delilah), Léo Delibes (Lakmé) and Jules Massenet (Thaïs), among others. Georges Bizet's Carmen premiered 3 March 1875. Carmen has since become one of the most popular and frequently-performed operas in the classical canon; Impressionist composers Claude Debussy ((La Mer) and Maurice Ravel (Boléro) also made significant contributions to piano (Clair de lune, Miroirs), orchestra, opera (Palléas et Mélisande), and other musical forms. Foreign-born composers have made their homes in Paris and have made significant contributions both with their works and their influence. They include Frédéric Chopin (Poland), Franz Liszt (Hungary), Jacques Offenbach (Germany), and Igor Stravinsky (Russia).