I like everynoise for this.
It's got (essentially) every genre plotted, "in general down is more organic, up is more mechanical and electric; left is denser and more atmospheric, right is spikier and bouncier." You can search for a specific artist and see what genres they fit, and how other artists compare. Really handy for finding new music.
Edit: oof, it looks like the creator was laid off from Spotify, which is where they were getting their data to maintain it, so now it's just a static snapshot :(