A musical instruction meaning 'on' in Italian, used to indicate playing technique on stringed instruments.
From Italian 'sul' meaning 'on' or 'upon', derived from Latin 'super'. In musical notation, it's used in phrases like 'sul ponticello' (on the bridge) or 'sul tasto' (on the fingerboard).
When violinists play 'sul ponticello' (on the bridge), they create an eerie, glassy sound that's become a signature effect in horror movie soundtracks. This technique was revolutionary when composers like Bartók first incorporated it into classical music.
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