Orchestras are usually led by a conductor who directs the performance with movements of the hands and arms. 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.
A string orchestra is known as an orchestra that has solely string section that has bowed strings used in Western Classical music.
The instruments in an orchestra are the violin, the viola, the cello etc. The Rite of Spring is known as a ballet and orchestral concert by the Russian composer Igor Stravinsky.
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