Anglican church music is music that is written for Christian worship in Anglican religious services, forming part of the liturgy. It mostly consists of pieces written to be sung by a church choir, which may sing a cappella or accompanied by an organ. An Anglican choir typically uses "SATB" voices (soprano or treble, alto or counter-tenor, tenor, and bass), though in many works some or all of these voices are divided into two for part or all of the piece; in this case the two halves of the choir (one on each side of the aisle) are traditionally named decani and cantoris which sing, respectively, Choir 1 and Choir 2 in two-choir music. There may also be soloists, usually only for part of the piece. There are also works for fewer voices, such as those written for solely men's voices or boys'/women's voices.