dead march

noun2

1. •
   A mournful, deliberately-paced musical work suitable for a funeral or remembrance ceremony.

   • A captain's guard marched before the corpse, the captain of it in the rear, the firelocks reversed, the drums beating the dead march. — 1859
2. •
   Any of several particular notable musical works of this kind, such as the Marche funèbre by Frédéric Chopin or the funeral anthem in George Frideric Handel's Saul.

   • [W]hat divine ravishments may we not anticipate from this venerable, embrowned old organ, which might almost have played the Dead March in Saul, when King Saul himself was buried. — 1849