MALE CHOIRS
Male choirs with the same SATB voicing as mixed choirs, but with boys singing the upper part (often called trebles or boy sopranos) and men singing alto (in falsetto), also known as countertenors. This format is typical of the British cathedral choir (e.g. King's College, St Paul's, Westminster Abbey).
Women's choir, a choir of adult women, high voices only, usually consisting of soprano and alto voices, two parts in each, often abbreviated as SSAA, or as soprano I, soprano II, and alto, abbreviated SSA.