Irina's Theme is the title of the leitmotif for Soviet leader and main antagonist Irina Spalko, composed by John Williams for Indiana Jones and the Kingdom of the Crystal Skull. The theme has a Russian-sounding flavor, and is reminiscent of classic film noir B-movies in that it captures the deceptive and sensual nature of its subject. The smooth, snake-like saxophone and brass progressions overlapping an unsettling undertone musically portray Irina's malevolence.