"Underrated" and "awesome" tend to just... mean roughly the same thing in this context, and it's so individual it's hopeless to try to recommend stuff based on that alone. Popularity or unpopularity doesn't necessarily speak to how much you'll like it, either.
Recommendations are easier to give the better you know your tastes, and the better you can describe them.
You can also do some thinking about what you like and why, and see how others describe that song/album/artist/whatever to get some useful starting points. If you want to nerd out, Wikipedia and the like can tell you a lot about musical influences that shaped this or that style, and you can track it down and see if it resonates with you.
Can only hope they'll get flayed in court, but I sort of doubt it.