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Other instruments such as the piano and celesta may sometimes be grouped into a fifth section such as a keyboard section or may stand alone, as may the concert harp and electric and electronic instruments.

The so-called "standard complement" of double winds and brass in the orchestra from the first half of the 19th century is generally attributed to the forces called for by Beethoven. Apart from the core orchestral complement, various other instruments are called for occasionally.[1] These include the classical guitar, heckelphone, flugelhorn, cornet, harpsichord, and organ.

Among the instrument groups and within each group of instruments, there is a generally accepted hierarchy. Every instrumental group (or section) has a principal who is generally responsible for leading the group and playing orchestral solos. The principal first violin is called the concertmaster (or "leader" in the UK) and is not only considered the leader of the string section, but the second-in-command of the entire orchestra, behind only the conductor. The concertmaster leads the pre-concert tuning and handles technical aspects of orchestra management, usually sitting to the conductor's left, closest to the audience. In some U.S. and British orchestras, the concertmaster comes on stage after the rest of the orchestra is seated, takes a bow, and receives applause before the conductor (and the soloists, if there are any) appear on stage.

The principal trombone is considered the leader of the low brass section, while the principal trumpet is generally considered the leader of the entire brass section.


The first orchestras were made up of small groups of musicians that gathered for festivals, holidays or funerals. Mannheim had one of a famous early orchestra, where notated dynamics and phrasing, previously quite rare, became standard. The creation of standing orchestras also resulted in a professional framework where musicians could rehearse and perform the same works repeatedly, leading to the concept of a repertoire in instrumental music. A major expansion of symphonic practice came from Richard Wagner's Bayreuth orchestra, founded to accompany his musical dramas. Wagner's works for the stage were scored with unprecedented scope and complexity: indeed, his score to Das Rheingold calls for six harps. As the early 20th century dawned, symphony orchestras were larger, better funded, and better trained than ever before; consequently, composers could compose larger and more ambitious works. In the United States, the late 20th century saw a crisis of funding and support for orchestras. It is not uncommon for contemporary composers to use unconventional instruments, including various synthesizers, to achieve desired effects.

  1. ^ G.W. Hopkins and Paul Griffiths, "Instrumentation and Orchestration: 5. Impression and Later Developments", in ibid.