The closes thing I can find to what I THINK is the original poster's intention (and was mine as well) is to go to the new Radio tab while looking at your library music. Then click the âž• and you'll get an option for Featured Stations, which has a bunch, but then the "album cover" list below will let you click on them and select a sub-selection. For example, World, African. Or Alternative, then 80s. It's FAR FAR from perfect, but there you go.
The challenge I had is that I wanted it to behave like Pandora, where I start with an artist and then add artists that expand the reach of the station. I find that having select an artist (like Acoustic Alchemy for a smooth jazz feel) limits the scope of the station too much for me. The "generalized" options they provide are similar too broad.
Heh, images of too-hot and too-cold porridge come to mind 🙂