Music always emerges out with the goodness and soothing sound where the intensity and magnitude of the pitch is the factor in creating the different emotions. The loudness of the voice, softness of the voice, praying or appealing voice, roaring voice and much more are the qualities of the voice on what a singer perform or sang a composition or the melody. A flexible and good voice is the signature of good singing but, the term is good is not so easy to define. A good voice for playback singing for film music need to have different quality than a good voice to sing a Dhrupad or a good voice definition for Thumri is different than the good voice for Tappa. The quality of good voice is also varies from listeners to listeners and genre to genre of the music.
In Indian Classical Music Acharya Bharat has firstly described the quality of the voice in his renowned book called- Natyashastra. He describes six fundamental quality of the voice:-
Sharavak – The Sound which is clear audible to audienceGhana- Bold and Perfect Vocal
Snidhag –Gentle and softy even in loudness
Madhur - Sweet and soft soothing with perfect pitching
Avadhanvan – Centered or meditative voice
Tristanashovita – Sung in all three octave- Mandra – Madhya – Taar ( Lower Middle and Higher Octave
2. Grah- Samapti Gyan- Knowledge of Starting and Conclusion
3. Raga, Ragang, Bhasang, Kriyang, Upang ki Gyan- Knowledge of these elements
4. Prabandh Gyan, Aalpti Gyan, Gamak gyan, Taal and laya Gyan.. Etc.