Willoughby's Beach
Somewhat overshadowed by its counterpart, 12 Bar Bruise, Willoughby's Beach is nevertheless a solid first album (well, EP) and a great entry point to the band for fans of garage rock.
Willoughby's Beach is interesting in that you can already hear King Gizzard start to experiment with its sound - note the theremin in Crookedile, and the harmonica in Stoned Mullet that can still be heard as late as Omnium Gatherum.