An offstage brass and percussion part is a sound effect used in classical music, which is created by having one or more trumpet players (also called an offstage trumpet call), horn players, or percussionists from a symphony orchestra or opera orchestra play a note, melody, or rhythm from behind the stage. This creates a distant, muted effect which composers use to suggest "celestial voices", melancholy, or nostalgia, or to create a haunting effect.