Orchestra is known to be a large instrumental ensemble usually made of classical music. The best description of the performing ensemble in Dance of the Youths and Maidens from Part I of Stravinsky's The Rite of Spring is orchestra.
Orchestra often used various instruments from different families, such as the violin, viola etc.
It is known to be an ancient Greek word that belongs to a part of a stage where instruments and the chorus are fused together i music and drama to make theater.
The first form of a modern orchestra came into being in the early 17th century.
