Voice classification in non-classical music chart that follows. The ranges given below are approximations and are not meant to be too rigidly applied. Some men, in falsetto voice or as a result of certain rare physiological conditions, can sing in the same range as women. These do not fall into the female categories, instead called countertenors within classical music. Within contemporary music, however, the use of the term "tenor" for these male voices would be more appropriate. Teaching voice within non-classical music is an emerging field. Up to this point, voice teachers and voice research have been largely concentrated with classical methods of singing. However,
Voice classification in non-classical music in opera classification systems many other factors are considered. Indeed, tessitura (where the voice feels most comfortable singing) and vocal timbre (the innate quality of sound to the voice) are more important factors than vocal range within opera categorization. Within opera there are several systems in use including the German Fach system, the Italian opera tradition, and French opera tradition. All of these approaches to voice classification use some of the same terminology which sometimes causes people to confuse them with each other. In the operatic systems there are six basic voice types and then several sub-types within each type.