A group of musicians in formal black suits fills the lower half of L'Orchestre de l'Opéra, each absorbed in playing or preparing their instruments in the orchestra pit. The central figure holds a bassoon and sits in profile, his mustached face intent on the music, while his left hand rests on the instrument's long wooden body. To his left, a cellist cradles his instrument, his gaze lowered in concentration, and behind them, violinists and wind players cluster closely, their faces emerging from the dim light.

The musicians’ features are rendered with brisk, textured brushwork, capturing the individuality of each man and the gleam of their instruments beneath the stage lights. Above the musicians, the lower halves of ballet dancers in pastel tutus appear cropped at the waist, their legs poised and toes pointed, suggesting movement and the world of the stage just out of reach. The upper background is filled with the soft, blurred tutus and legs of the dancers, painted in pink, white, and blue, with touches of green from floral headpieces, contrasting with the dark, earthier tones of the orchestra below.

The composition is tightly framed, with the orchestra pit’s red velvet rail running along the bottom edge, and the musicians pressed together in a shallow space, emphasizing the intimacy and intensity of performance. Brushstrokes are visible in the textured rendering of hair, fabric, and wood, while the faces and hands are modeled with more delicate transitions, revealing Degas’s attention to both structure and fleeting expression. This work blurs the line between portraiture and genre painting, as each musician is both an individual likeness and part of a larger scene of modern life.