1. Range: The ability to sing a wide range of notes, from low to high, without strain or discomfort.
2. Volume: The capacity to produce a powerful, resonant sound that can fill a room or concert hall.
3. Tone: A pleasing, well-rounded sound quality, free from nasality, harshness, or vocal fry.
4. Projection: The ability to send the voice clearly and evenly throughout a space, so that it can be heard and understood by listeners in all areas.
5. Intonation: Singing in tune, with accurate pitch and intonation.
6. Expression: The ability to convey emotion and musicality through the voice, adding depth and nuance to the performance.
7. Agility: The ability to sing rapid passages, ornaments, and runs with precision and clarity.
8. Control: Maintaining a steady, controlled airflow and breath support to produce a smooth, consistent vocal tone.
9. Power: The capacity to sing with strength and intensity without sacrificing vocal quality.
10. Stamina: The ability to sustain vocal power and endurance throughout a performance without vocal fatigue or loss of tone.
A strong singing voice is not just about vocal power, but also about vocal health and technique. Vocalists who consistently use proper singing technique tend to have stronger voices that last longer and are less prone to damage.