Final answer:
Parallel processing best illustrates the ability to simultaneously process the pitch, loudness, melody, and meaning of a song.
Step-by-step explanation:
Parallel processing best illustrates the ability to simultaneously process the pitch, loudness, melody, and meaning of a song. Parallel processing refers to the brain's ability to process multiple aspects of a stimulus at the same time. In the case of a song, our brain can process the different elements, such as the pitch, loudness, melody, and meaning, concurrently, allowing us to perceive and understand the song as a whole.