An arrangement often refers to a change in medium or style and can be instrumental, not necessarily vocal music.
[3] Texts commonly used in choral settings include the mass and the requiem in Western Christianity, and the Divine Liturgy of St. John Chrysostom and the All-night vigil in Eastern Christianity.
Examples include Mozart's Great Mass, and Leontovych's Liturgy of St. John Chrysostom.
A poem that has been set to music is known as an art song[4] or Lied (German variant).
Composers known for their art songs include Franz Schubert and Robert Schumann.