Chamber Music is simply music written and performed by a small number of musicians (usually 2-9) with one player to a part.
Chamber music is usually performed without a conductor, so the musicians themselves have to learn to work together and communicate without words during performance and rehearsal.
One of the great things about chamber music is that it can be performed in a smaller space than a concert hall, which allows the audience to feel more a part of what’s going on rather than simply spectators.
The term originally referred to music that was not intended to be performed in church, the theater or a concert hall, but rather to be performed in a “chamber” or room of a home. But now chamber music is performed everywhere, from homes to concert halls.