Horn instruments are a family of musical instruments that produce sound through the vibration of air in a tubular structure. They are typically made from materials like brass or wood and include instruments such as the trumpet, trombone, and French horn. These instruments are commonly used in orchestras, bands, and various music genres. Horn instruments can be categorized into two main types: natural horns and valved horns. Natural horns produce sound through the player's lip vibrations and have no valves, while valved horns, like the trombone and trumpet, have valves that allow players to change pitches more easily. Both types are essential in creating rich, powerful sounds in music.