Final answer:
Wagner's leitmotives are distinct in that they are recurring musical phrases that evolve with the drama of the opera, providing a unique narrative depth and emotional complexity.
Step-by-step explanation:
One thing that distinguishes Wagner's leitmotives from typical melodic material is their use as a musical and dramatic device. Leitmotives in Wagner's operas are short, recurrent musical phrases associated with a particular character, theme, or location. These motives are not just simple melodies; they evolve throughout the opera, changing and developing in conjunction with the drama.
Wagner's sophisticated manipulation of these themes allowed for a unity and coherence in his operas that could convey complex emotional and narrative nuances not possible with conventional melodies.