The term MUSIC-SCORE SYMBOL is represented by the four-letter word CLEF. A CLEF is a musical symbol used to indicate the pitch of written notes. It is placed at the beginning of a staff, which is a set of five horizontal lines and four spaces that each represent a different pitch. The most common clefs are the treble CLEF, bass CLEF, and alto CLEF. Each CLEF indicates which pitches should be played on which lines and spaces of the staff.