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,
Bass (voice type) comic-relief fool in bel canto operas. English equivalent: dramatic bass "Basso profondo" (lyric low bass) is the lowest bass voice type. According to J. B. Steane in "Voices, Singers & Critics", the basso profondo voice "derives from a method of tone-production that eliminates the more Italian quick vibrato. In its place is a kind of tonal solidity, a wall-like front, which may nevertheless prove susceptible to the other kind of vibrato, the slow beat or dreaded wobble." English equivalent: dramatic low bass. Dramatic basso profondo is a powerful basso profondo voice. All of the Gilbert and Sullivan Savoy operas, except