Final answer:
Timbre in early music notation indicates the pitch of the sound that distinguishes it from other sound. It is affected by the interplay of frequency, amplitude, and timing of sound waves.
Step-by-step explanation:
Timbre is the pitch of the sound that distinguishes it from other sound. It refers to a sound's purity and is affected by the complex interplay of frequency, amplitude, and timing of sound waves. Terms such as dull, brilliant, warm, cold, pure, and rich are used to describe the timbre of a sound.