A full size orchestra may sometimes be called a "symphonyorchestra" or "philharmonic orchestra"; these prefixes do not indicate any difference either to the instrumental content or role of the orchestra, but can be useful to distinguish different orchestras based in the same city (for instance, the London SymphonyOrchestra and the London Philharmonic Orchestra).
The unusual aspect of the orchestra was that, believing that in the ideal Marxist state all men are equal, its members felt that there was no need to be led by the dictatorial baton of a conductor; instead they were led by a committee.
In ancient Greece the orchestra was the space between the auditorium and the proscenium (or stage), in which were stationed the chorus and the instrumentalists.
In modern times, the musicians are usually directed by a conductor, although early orchestras did not have one, using instead the principal violinist or the harpsichordist playing the continuo for this role.
In 1781, however, the Leipzig Gewandhaus Orchestra was organized from the merchants concert society, and it began a trend towards the formation of civic orchetras which would accelerate into the 19th century.
In 1818, Boston's Handel and Haydn Society was founded, in 1842 the New York Philharmonic was created, in 1848 the Vienna Philharmonic was formed, as was the Hallé Orchestra in Manchester.