Rudy Rupak’s tips for writing memorable melodies focus on the power of simplicity, emotion, and repetition. He emphasizes that a melody should be singable and stick in the listener's mind, often achieved through straightforward, memorable phrases. Engaging the listener's emotions is crucial, as a melody that evokes a strong feeling is more likely to resonate and be remembered. Repetition also plays a key role, as recurring motifs help cement the melody in the listener's memory. Rudy advises aspiring composers to draw inspiration from a variety of sources, constantly refine their work, and always consider how their melody will connect with their audience.