prelude

prelude is a   Noun

Definition:

[1] An introductory performance, preceding and preparing for the principal matter; a preliminary part, movement, strain, etc.; especially (Mus.), a strain introducing the theme or chief subject; a movement introductory to a fugue, yet independent; -- with recent composers often synonymous with overture. The last Georgic was a good prelude to the Ænis Addison. The cause is more than the prelude, the effect is more than the sequel, of the fact. Whewell.

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