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,
The Singing Voice of Japan choir organ "Utagoe" (June 1949) in these terms: However, even after the first issue of the choir organ, the script for the Japanese word "Utagoe" in Kanji (歌声) and one mixed with Hiragana (歌ごえ) were sometimes used by authors of books or periodicals concerning The Singing Voice of Japan, while an exclusive formalization of Hiragana script (うたごえ) has never been imposed by any official organization of the movement. A very remarkable example of the graphical oscillation would be the autograph of Akiko Seki dedicated to the national Festival of December 1962, in which she wrote one of the movement slogans