grace note

A small note, often used to show an ornament or embellishment, that is not counted towards the number of beats in the bar; instead, it steals from the duration of either the preceding or the following rhythmic notes. Also known as an “arhythmic” or “crushed” note. In common practice, a grace note with a slashed stem is an “acciaccatura”, which is to be played as quickly as possible, either immediately before or at the rhythmic position of the note or chord that follows it. A grace note with an unslashed stem is an “appoggiatura”, which is played as half of the written duration of the note or chord that follows it.