Say I search for "Opeth" in Apple Music. On the bottom of the search results page, there is a section called "Stations" with one result "Opeth Radio". (This works for any artist, it seems.) What exactly is this? A list of songs picked by Opeth? A list of songs that sounds similar to Opeth? A "people who liked Opeth also liked" list of songs? Is it generated as I go and like/dislike songs?