Chamber music work is a type of musical composition that is typically performed by a small group of musicians, usually three in number. The term 'TRIO' is used to refer to this type of ensemble, which is why it is the answer to the crossword clue. Chamber music works are often composed for instruments such as strings, woodwinds, and brass, and they can range from classical to modern styles. Chamber music works are often considered to be more intimate than larger orchestral works, as the smaller group of musicians allows for more subtle nuances in the music.