This document summarizes different families of musical instruments. It describes strings, woodwinds, brass, and percussion instruments. Strings make sounds by vibrating strings through bowing, plucking, or striking. Woodwinds set air into vibration through a mouthpiece or reed. Brass instruments create sound from vibrating lips into a mouthpiece. Percussion instruments are the most ancient and are used for rhythm, with membranophones like drums struck by hands or sticks, and idiophones making sound by striking their materials.