Four.
Strings, winds, brass, percussion.
Up to date there are 5: Woodwinds, Brass, Strings, percussion, and electronic.
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It varies. Ever hear the term "12 piece orchestra"? That's an orchestra with 12 players.
It depends on how large the band is.
The size of most orchestra's will vary depending upon which work(s) is/are being performed. Many composers were quite specific about what instruments would be employed to play their works.
There are usually 2-3 Cello's in an orchestra
A full-size orchestra consists of about one hundred musicians, who play instruments in the string, brass, woodwind, and percussion sections. There are also chamber orchestras, which are smaller and consist of fifty musicians or fewer.
A full orchestra consists of many types of instruments. Scores of music for a full orchestra would include parts for strings, woodwinds, brass, and percussion instruments.
The actual count and type of woodwinds instruments required in an orchestra is determined by the composer of the piece. Not every single woodwind instrument is used in every single classical piece.
in an orchestra you should have between 2-10 different instruments i think.......(i only think)
An orchestra can contain up to nine percussion instruments including tambourines, cymbals, a piano, bass drums, snare drums, vertical chimes, kettle drums, gongs, and whistles.