Assertion: classical music's form | /r/HasProperty | required for the overture
Facets:
value: no longer
type: TEMPORAL
Source sentences:
text: In 19th-century opera, in some operas, the overture, Vorspiel, Einleitung, Introduction, or whatever else it may be called, was the portion of the music which takes place before the curtain rises; a specific, rigid form was no longer required for the overture.