A single-movement concert piece for orchestra that might evoke a land- or seascape or embody a patriotic or literary idea is called an overture.
A sonata-style composition with one movement for orchestra is referred to as a "concert" since it was created for the concert stage rather than necessarily the theater. A single movement, free-form symphonic poem (tone poem) that is based on a poem, story, or literary or philosophical model emerged from the Concert Overture.
A piece of music called an overture is played by the orchestra at the start of an opera or ballet. Due to the fact that it "opens" the show, the name is derived from the French word for "opening." Typically, overtures feature music that will be played throughout the opera or ballet. In this way, it gets the audience ready for what's coming.
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