ik twentyonepilots is probably not considered underrated but you should still listen to them, and im like 70% sure an album will be coming by the end of the year
Production wise I really enjoy Awolnation, Ashnikko's songs, Billie Eilish's tracks produced by Finneas, Grandson, Breakbot, Cage The Elephant's two latest albums, Muse's Simulation Theory album, Half Alive, Twenty One Pilots, Zedd, and Gorillaz. Also love the Beastie Boys's albums. These are some of the ones I get inspired by production wise, hence I didn't mention more bands leaning towards rock. These aren't really underrated but still, would recommend all of them!
Still Woozy has some really chill vibey songs such as Goodie Bag.
If you're looking more in the Rap / RnB direction, I highly recommend 99 Neighbors, they're one of my favorite bands. nothing,nowhere. is also a great hip hop artist.
Novo Amor and Lord Huron are very folky and chill.
$uicideboy$
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youtube.com/watch?v=Iqot2danZXg
youtube.com/watch?v=qbofHeelsvg
youtube.com/watch?v=-vXVeo8Ox7A
Those are just a few of their good song (In my opinion)