All music lovers are well known such choirs as Leningrad academic Cappella them. M. I. Glinka, Republican choir to them. A. A. Yurlov. However, the word Cappella - cappella - translated from Italian means "chapel". What is the relationship of the chapel to the choir?
In Catholic churches for many centuries the worship accompanied by music. In cathedrals and large churches have long been constructed bodies. Organists were improvised, was accompanied by his play choir singing, and the service was very solemn, made a strong impression on the faithful. But it was necessary for the clergy. But in small churches, chapels bodies. Chorus there had to sing without accompaniment. So over time singing without instrumental accompaniment and began to call: a cappella ("as in the chapel"). And the choir became known as the chapel.
But in the Orthodox choral art has always been used singing exclusively a Cappella.
The term a Cappella is used in a broader sense: the so-called any vocals that sing without musical accompaniment.