I think a different problem that some people may be thinking of when they post this question is: how do I find new music which is like this given song? It's a

I think a different problem that some people may be thinking of when they post this question is: how do I find new music which is like this given song? It's a narrower question but all the more interesting for it. Most algorithmic recommendations rely on "other people who played a cumulative ten tracks from this artist played ten tracks from this other artist" or pretty vague slices of tag-clouds intersecting along n dimensions, or worse yet influencers who are perpetually hyped up about a n new thing, and that can generate some new-to-you recommendations, yet I long to find ways of answering the former question.