The Vienna Boys' Choir (German: Wiener Sängerknaben ) or Vienna Choir Boys is a choir of boy sopranos and altos based in Vienna, Austria. It is one of the best known boys' choirs in the world. The boys are selected mainly from Austria, but also from many other countries.
The choir is a private, not-for-profit organization. There are approximately 100 choristers between the ages of ten and fourteen. The boys are divided into four touring choirs, named after Austrian composers Bruckner, Haydn, Mozart and Schubert, which combined perform about 300 concerts each year before almost 500,000 people. Each group tours for about nine to eleven weeks.