They are generally more experimental in creating sound, depending on the piece. Chamber orchestras require very strong players, because even one person making a mistake is much more likely to be heard. When only about twenty people are playing, with four to six on each part, each person must be able to hold his or her own in the music. People must be able to know each other much better than in a larger orchestra. In chamber orchestras, unlike in quartets, there is a conductor.
Quartets are relatively common, especially for weddings and other formal engagements.
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