Other people have called out limitations and I don't disagree, but I'll say that I do find the different approach, based entirely on sounding similar, interesting. Recommendation engines in music streaming services often tell me about related things I already know I like. That's not necessarily unwelcome (if I'm listening to one song that appears in Footloose, sure, it's not a bad surmise that I might like to hear another), but this tool surfaces a bunch of stuff I would have never thought to look for or found normally.