Voice type in baroque operas. Except for a few very rare voices (such as the American male soprano Michael Maniaci or singers with a disorder such as Kallmann syndrome), singers called countertenors generally sing in the falsetto register, sometimes using their modal voice for the lowest notes. Historically, there is much evidence that the countertenor, in England at least, also designated a very high tenor voice, the equivalent of the French "haute-contre". Until about 1830, all male voices used some falsetto-type voice production in their upper range. Countertenor voices span a broad range, covering E3 to E5. Countertenor subtypes: Countertenors are often
Voice classification in non-classical music a solo vocalist. Children's voices, both male and female, are described as trebles, although the term boy soprano is widely used as well. In non-classical singing, it is difficult to place voices within either system for two major reasons. First, these voice categorizations were made with the understanding that the singer would be using classical vocal technique. These specific techniques, through study and training, result in a particular kind of vocal production and vocal timbre for each voice type which is unique to classical music. This is particularly problematic when trying to apply the operatic terms, as the vocal types