The chanter is usually open-ended, so there is no easy way for the player to stop the pipe from sounding. Thus most bagpipes share a constant, legato sound where there are no rests in the music. Primarily because of this inability to stop playing, technical movements are used to break up notes and to create the illusion of articulation and accents. Because of their importance, these embellishments (or "ornaments") are often highly technical systems specific to each bagpipe, and take many years of study to master. A few bagpipes (such as the musette de cour, the uilleann pipes, the Northumbrian smallpipes, the piva and the left chanter of the surdelina) have closed ends or stop the end on the player's leg, so that when the player "closes" (covers all the holes) the chanter becomes silent.