An orchestral section is a group of musicians within an orchestra. Violas are string instruments with six strings and a deep, mellow sound. Woodwinds are a family of instruments that produce sound when air is blown through them. They include flutes, oboes, clarinets, and bassoons. BRASS instruments are made of metal and are played by buzzing the lips into a mouthpiece. They include trumpets, trombones, and tubas.