Weird and mysterious: algorithms and how/why they work for some some and not from others. In my case, in general it works so well that it tore me from Pandora after years of working on that one (I think initially having my entire library to “look at” and use, whereas pandora didn’t, must have made the difference at that time), and now I’m hell-bent on perfecting this one. I think the other commenters insight may have at least a bit to do with it (I mean, most of my original library was not gotten from Apple, but I’ve been streaming, rating, loving, and also getting their versions for a long time now, so it likely has an impact on the effectiveness…).