Antiphonal Singing
A further stylistic technique is used in cathedrals and churches which use an antiphonal style of singing. In this case, the choir is divided into two equal half-choirs, each having representation for the four musical parts, and usually facing one another. They are typically named Decani (usually the half-choir to the south side) and Cantoris (usually the half-choir to the north side). Then the choir may employ either of the techniques known as quarter-chanting and half-chanting. In quarter-chanting, the side that starts (usually decani) sing the first quarter of the chant (and thus the first half of the verse). The side that did not start (usually cantoris) then sing the second quarter of the chant (and thus the second half of the verse). This sequence then repeats. In half-chanting (which is more true to antiphonal singing in the Gregorian style), decani sing the first two quarters of the chant, and cantoris the next two quarters (so that each half-choir sings a whole verse at a time).
With antiphonal singing, the first two verses, Gloria and perhaps last two verses are often sung by the whole choir.
A few choirs (such as King's College, Cambridge) elaborate further, e.g. by having some verses sung by soloists, trebles only, alto/tenor/bass only (with the treble line transferred into one of the other parts) or one part or soloists singing the melody while the rest of the choir hums. Occasionally some or all trebles may sing a descant; this usually happens only in the final verse of the psalm and/or the Gloria.
Read more about this topic: Anglican Chant
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