ANAKRUSIS, from the Greek, meaning literally "up beat," has been defined in poetry as, "a syllable at the beginning of a verse before the just rhythm"; otherwise, an introductory weak accent preceding a strong one. In music the term is similarly applied to the notes on the weak beats of the bar, more especially to that on the last beat, preceding the strong one on the first beat of the following bar, and constituting very frequently an appar ently incomplete bar when occurring at the beginning of a corn position.