Meaning of Ictus in Music
In music, the term "ictus" refers to the recurring stress or beat in a rhythmic or metrical series of sounds. It is the moment when the beat occurs and is usually indicated by a sudden click of the wrist or a change in baton direction by a conductor. The ictus marks the downbeat, which indicates the first beat of the bar, as well as the upbeat, which indicates the beat before the first note of the piece and the last beat of the bar. The continuous flow of steady beats is called the "takt". The gesture leading up to the ictus is called the "preparation".
With the spoken word, ictus indicates the stress or accent on the syllable or foot of a verse. In music, the term ictus is used in conducting to denote the specific point in a visible pattern of beat points that articulates the pulse of the music to the ensemble. This is typically the lowest point in the conducting patterns.
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