Psychedelic rock, garage rock, jazz/jazzy rock, hard rock, thrash metal, 60s-ish pop rock: King Gizzard and the Lizard Wizard. 100% top of my list to check out, they do so many different things well.

Sour Soul by Ghostface Killah and BADBADNOTGOOD is a great rap album that doesn't get enough love.

Definitely not underground but Black Star by Mos Def and Talib Kweli is top tier.

Joey Bada$$' first mixtape 1999 is worth a listen

I've been on a Neil Young kick recently. Southern Man has an interesting history and that got me digging more into his back catalogue. I'd start with his greatest hits honestly.