Original sentence: A vocal warm-up is usually required before the vocal cords are expected to perform at their full potential.Numerous exercises have been devised to facilitate this warm-up, such as the popular "Bumblebee Don't Sting Me" exercise in diatonic thirds.Proper breathing technique is also a key factor in singing correctly.Solfege assigns certain syllables to the notes of the scale
Edited sentence: 'The study of voice today does not often involve true understanding of vocal culture.A properly trained singer has  complete mastery of the vocal instrument and a  solid and balanced vocal technique.A well-produced voice is a beautiful voice and it is a healthy voice.After proper training, the vocal instrument will prove to be healthy and balanced and the singer will achieve maximum vocal efficiency, independence and freedom of expression in both voice and body.Although today we are surrounded by confusing ideas about the "numerous" techniques available, the study of singing is a careful and detailed acoustical and physiological study of balancing tone, air and word that brings a singer to a full understanding of his/her voice as well as allowing the singer complete freedom, sponteneity and ease of tone and words.Enlarged ed.New York: Taplinger, 1957.Solfege'' assigns certain syllables to the notes of the scale.The great voice teacher, Giovanni Battista Lamperti (1839-1910) believed that: “The true method of singing is in harmony with the rules of nature and of health.The singer who uses the voice in a physiologically correct way does not have jaw or tongue tension, does not suffer from hoarseness or other forms of vocal strain.They actually do not warm up OR train the voice, they merely tire it or put it into a state of tension.Vocal "warm-ups" and mechanical “vocalises” that have now become an accepted and expected  part of a singer's routine, are misused and abused.Vocal Wisdom:  Maxims of Giovanni Battista Lamperti, 1931.by Lillian Strongin.” Brown, William Earl