Strings—violins (smallest, and highest in pitch), violas, cellos, and double basses (largest and lowest in pitch). These players sit in a semicircle directly in front of the conductor, and make up more than half the orchestra.

Woodwinds—flutes, oboes, clarinets, bassoons, and related instruments. These players sit a few rows back from the conductor, in the center of the orchestra.

Brass—trumpets, horns, trombones, tubas, and similar instruments. These instruments are the loudest, so you'll see them at the back of the orchestra.

Percussion—the drums, bells, and other fascinating paraphernalia that are struck, plucked, rubbed, etc. This includes the kettledrums, the harp, and, on occasion, the piano. Some works use lots of different percussion; others may have a single musician playing the kettledrums, or no percussion at all. The percussion section is also found at the back of the orchestra.

Special thanks to the American Symphony Orchestra League for their
assistance with this section