treble2

noun

• a high-pitched voice, especially a boy’s singing voice.
• a boy or girl with a treble voice.
• a part written for a high voice or an instrument of a high pitch.
• [as modifier] denoting a relatively high-pitched member of a family of similar instruments:a treble viol
• (also treble bell) the smallest and highest-pitched bell of a set.
• the high-frequency output of an audio system or radio, corresponding to the treble in music.