SATB

In music, SATB is an initialism for soprano, alto, tenor, bass, defining the voices required by a chorus or choir to perform a particular musical work. Pieces written for SATB, the commonest combination and that used by most hymn tunes, can be sung by choruses of mixed genders, by choirs of men and boys, or by four soloists. There is a lack of gen
Found on http://en.wikipedia.org/wiki/SATB

SATB

(from the article `score`) ...in a concerto, it customarily appears immediately above the strings. In vocal works the standard arrangement from top to bottom is soprano, alto, ...
Found on http://www.britannica.com/eb/a-z/s/34
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