The term 'Chamber Group Woodwind' refers to a group of woodwind instruments that are typically used in chamber music. The most common instrument in this group is the OBOE, which has four letters. The OBOE is a double-reed instrument with a conical bore and a cylindrical bell. It is usually made of wood and is played with a reed. The OBOE is known for its distinctive sound and is often used as a solo instrument in classical music.