found: New Grove, July 10, 2007(Allusion: a reference in a musical work to another work or to a style or convention, in a manner akin to an allusion in speech or literature, or the act of making such a reference. Allusion to a particular work is generally distinguished from quotation in that material is not quoted directly, but a reference is made through some other similarity between the two works, such as gesture, melodic or rhythmic contour, timbre, texture or form; some writers consider quotation a type of illusion; allusion is different from other forms of borrowing, such as paraphrase, variations or cantus firmus, which elaborate borrowed musical material without necessarily demanding interpretation or conveying meaning.)
