How is the term "timbre" commonly defined in music?

The term "timbre" is commonly defined as the color or quality of sound. It represents the distinctive character or quality of a sound that allows us to distinguish between different instruments or voices, even when they are playing the same pitch at the same volume. Timbre is affected by various factors, including the instrument's material, the way it produces sound, and how the sound waves combine. For instance, a piano and a violin can play the same note, but they sound quite different due to their unique timbres. Understanding timbre helps musicians and listeners appreciate the richness and diversity of sound in music.

Rhythm refers to the timing of notes and is not related to timbre. Pitch deals with how high or low a sound is, which again does not encompass the quality of the sound. Volume level, while relevant to how loud or soft a sound is, does not define its character or quality. Thus, the definition of timbre as the color or quality of sound most accurately encapsulates its meaning in music.