But on the topic of Apple, I would say its just not that deep. Their UI/UX is factoring in the relevance of certain things, while also using some of the image metadata that all their audio files have associated with them. The graphics team factored in an ongoing music collector culture and their own preference and the medium its being played on (the phone and app system). It wouldn't be surprising if a future update did have basically a simple list, with a drilled-in view of what's playing, similar to most other music discovery apps.