Fourvoice

Fourvoice refers to a musical texture consisting of four independent melodic lines performed simultaneously. In Western music, this is commonly realized as four-part harmony, traditionally arranged for soprano, alto, tenor, and bass voices (SATB). The term is used in music theory and choral practice to describe a standard ensemble texture for polyphonic or homophonic settings.

Historically, four-voice writing became a dominant texture during the Renaissance and remained prevalent through the Baroque period, continuing to appear in church music, motets, masses, and concert works. Composers emphasized voice-leading, with goal-oriented rules such as avoiding parallel perfect intervals and maintaining range-appropriate voices to preserve legato lines.

Notation and performance: Four voices are typically notated on two staves, with soprano and alto on the treble staff and tenor and bass on the bass staff, though transposition and instrumental adaptations exist. In choral singing, four-part choirs divide a musical piece into four lines that blend to form a cohesive texture, balancing melodic lines with harmonic support.

Modern usage: The four-voice texture remains foundational in education, orchestration, and choral ensembles, including church choirs, college choirs, and contemporary a cappella groups. While many arrangements use four-part harmony, composers and arrangers adapt the concept to ensembles of varying size and to arrangements for mixed voices or reduced voicings.

See also: four-part harmony, SATB, polyphony.