Musique concrete Music composed with natural sounds recorded electronically. Nationalism A nineteenth-century movement promoting music built on national folksongs and dances, or associated with national subjects. Neuma A sign in very early manuscripts indicating pitch. Bottom Top O Opera A play set to music. Opera buffa Italian comic opera.
Opera seria Serious and heroic opera of the Baroque period.
Oratorio Long, semi-dramatic piece on a religious subject for soloists, chorus, and orchestra. An orchestral piece at the start of an opera, oratorio, etc. A long, oratorio -like composition telling the story of Jesus's last days, according to one of the New Testament Gospels. Plainsong Liturgical chant , such as Gregorian chant . Program music Instrumental music associated with a story or other musical idea.