Tone color, also known as timbre, refers to the quality or character of a sound that distinguishes it from other sounds. It is what makes a piano sound different from a guitar, even when they play the same note. Tone color is influenced by various factors, including the instrument's material, shape, and the way it is played. In music, tone color plays a crucial role in creating mood and emotion. Composers use different instruments and their unique tone colors to evoke feelings and enhance the overall experience of a piece. For example, a violin can produce a warm, rich sound, while a trumpet may offer a bright, piercing tone.