SATB
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SATB is a frequent initialism for Soprano, alto, tenor, bass, referring to a common scoring for choruses and choirs. Pieces written for this combination can either be sung by choruses of mixed genders, or by choirs using a combination of men and boys.
Other common variants include SATTB, where the lower 'tenor' is usually pitched as a baritone, SSATB and SSATTB.