♫ Vague Voice Without Pathological Cause?
♭ Voice quickly tired?
♬ Weak voice?
♮ Need for voice training due to vocal cord disease or after surgery?
♪ Professional reasons to improve the purity of speech? Increase voice volume or intensity? improve complexion or hue?
♭ Personal reasons for improving speech?
♫ Speech articulation problems or gauging changes in intonation consonants or diphthongs?
♩ Preventing having an impact or serious problems due to voice sensitivity?