Timbre is a term used to describe the unique sound of a musical instrument or voice. It is composed of several elements, such as ACCENT, INFLECTION, PITCH, QUALITY, TONE, TONALITY, COLOUR, and INTONATION. ACCENT refers to the emphasis given to certain notes or syllables. INFLECTION is the variation in PITCH or volume of a sound. PITCH is the frequency of a sound, which determines its height or depth. QUALITY is the distinctive character of a sound. TONE is the general character of a sound. TONALITY is the system of notes used in a piece of music. COLOUR is the timbre of a sound. INTONATION is the rise and fall of PITCH in speech. All of these elements combine to create the unique timbre of a sound.