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In the middle of the Eighteenth Opersanger (o'-per-seng-er) Ger. n. Century the opera in Italy, Germany An opera singer. and France seemed lacking in vitality, ophicleide when Gliick, whose theory of music is A metal wind instrument, invented much like that of Wagner, departed about 1790, having a large tube of from the traditional form of the opera conical bore, bent double, with a and gave it _ life. Mozart worked cupped mouthpiece. It is a develop under Italian influence for a time; his ment of the old wooden serpent and technical powers and dramatic sense was sometimes made partly of wood; made him one of the great composers it is the ba representative of the who influenced all later operatic keyed bugle family. writers. Since then there have been ophicleide stop various forms of operas. Abbr. Op. An organ stop producing a tone opera ballad the ophicleide, powerful but harsh,like One which is more lyrical or sentiophicleid A per for istmer on the ophicle mental than dramatic. ide. 388 369 orchestra opposite opposite oratorio oratorio (6r-a-to'-ri-o) It. n. An adjective, applied to the progre ion or change of pitch of two or A vocal composition consisting of more related parts signifying that one solos, duets, trios, quartets and part ascends while another descends, choruses. The subject is usually of biblical foundation or taken from