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 "The singing voice is the vitality of peace" () using mixed script of both Kanji and Hiragana for the word "Utagoe", precisely such as: 歌こえ [sic]. In accordance with the slogan "Let's sing for the struggle of the working class" (), activists of the movement have composed many songs to encourage workers protest against illegal discrimination of their employers. In the 1960s, instruction of militants of the movement and continued improvement of their ideological, political and artistic quality were considered important means of cultural policy by the Japanese Communist Party (). Nowadays (2016), the only group that is active and