Timbre is the QUALITY of sound or voice that distinguishes it from other sounds or voices. It is often described as the 'COLOR' of a sound, and is determined by the harmonic content, attack time, decay, and other characteristics of a sound. Timbre is an important factor in music production, as it can be used to create unique sounds and textures. It is also used to differentiate between instruments and voices, as well as to create a sense of atmosphere in a recording.