overture -
Dictionary
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o·ver·ture
/ˈōvərˌCHo͝or,ˈōvərˌCHər/
noun
an orchestral piece at the beginning of an opera, suite, play, oratorio, or other extended composition.
"the overture to Mozart's “Don Giovanni”"
Similar:
prelude
introduction
opening
introductory movement
voluntary
verset
an introduction to something more substantial.
"the talks were no more than an overture to a long debate"
Similar:
preliminary
prelude
curtain-raiser
introduction
lead-in
precursor
forerunner
harbinger
herald
start
beginning
opener