Final answer:
Janice's function of listening illustration is focused on listening to music for pleasure, which is a form of radio programming that caters to specific musical tastes.
Step-by-step explanation:
Janice is illustrating the function of listening to music purely for pleasure on her iTunes playlist. This leisure activity is an example of how radio programming is often targeted to specific audiences based on their musical preferences. While podcasts, audiobooks, and radio shows also serve as popular audio content, each serves a different function and targets distinct audiences. Podcasts, for instance, can explore a wide range of topics and are enjoyed by many for their convenience and the presence of celebrity hosts. However, in Janice's case, she is engaging with the content not to gain information or follow a narrative, as one might with podcasts or audiobooks, but rather to enjoy the music that she loves.