Comment by fein

Not the same at all but I use this site to find artists that are "close" to an artist I already listen to a lot. I like it a lot.

https://www.music-map.com/porcupine+tree

Not sure how well this works for what you have in mind, but it may help. I'm not a fan of the "just play stuff related to the artist I'm listening to" to find new things, rather I would prefer to get a list of artists and explore those on my own.