The famous "Mozart Lullaby," or Wiegenlied , was long wrongly attributed to Wolfgang Amadeus Mozart , but research points to composer Bernhard Flies or Johann Friedrich Anton Fleischmann. While not a true Mozart original, the piece became widely popular in the 1990s due to the "Mozart Effect" and remains a favored choice for bedtime music boxes, promoting relaxation and security for babies. The Curious Case of Mozart's “Lullaby”