You might think that when it comes to voice types, everything depends on vocal range. Yet the actual notes a person can sing are only a small part of what determines their vocal category. A huge deciding factor is a concept known as timbre, or tonal quality. Timbre is entirely different from a musical note: A note (or pitch) refers to the place a single sound falls on a scale, while timbre is the phenomenon of the specific color or texture of a voice.