Nonagon Infinity - King Gizzard and the Lizard Wizard. Though their other 25 albums are awesome too.
I am also partial to their album PetroDragonic Apocalypse; or, Dawn of Eternal Night: an Annihilation of Planet Earth and the Beginning of Merciless Damnation. Probably my favorite metal album, and they aren't even a pure metal band.
I think my personal favorite is Omnium Gatherum, but it has some ups and downs. Nonagon Infinity is pretty much flawless from top to bottom (and back to top)