The quality of a sound; that component of a tone that causes different instruments (for example a guitar and a violin) to sound different from each other while they are both playing the same note.the spectral pattern defining the tone quality<br><br>Quality of musical tone; thin, thick, light, dark, sharp, dull, smooth, rough, warm, cold, etc.<br><br>What makes an instrument sound like that instrument and not another, even though the other instrument may be playing the same pitch.