Falsetto
Falsetto singing was used in the days when women were not allowed to sing in churches.  Instead, men sang countertenor.  Later the popularity of the countertenor disappeared, but in the mid 20th century it became popular again for performing Renaissance and Baroque music. Today the tradition of men singing alto (with countertenor voices) still exists in Britain in cathedral choirs and some church choirs which are all-male choirs.  It is not a big, operatic voice, and it blends in well with boys’ treble voices in the acoustic of churches and cathedrals.