Hayedeh: Classical and pop music vocalist with a contralto vocal range

Vocal intonation

A great singer will have great pitch accuracy. The pitch will play a vital role in singing because being off-key by more than half a semitone will be considered poor ability in the industry.

Shape and size of your pharynx and nasal cavities

Your physiology (things such as your facial structure and respiratory system) will likely affect your tone.