Recommendation cocktails are the way to go.
Most recommendations are either one dimensional (if you liked X you’ll like Y), or, more often, assume that all our little quirks added up describe our one true nature (e.g. Amazon). In fact we’re more complex then that, described by a multitude of often unrelated vectors. Pandora lets you experiment with the dot products.
Thanks Rob for pointing out this feature, I had missed it the first time through, and had written off Pandora.