Deja Vu by Crosby, Stills, Nash and Young. (60's Psychedelic rock, nearly all of the songs were hits, that's how good it is)
Twin Fantasy by Car Seat Headrest (indie rock)
3D Country by Geese (country rock made by a punk band)
[the future academy of noise, rhythm and gardening presents...] The Dream by The Orb. (Ambient house? Can't remember the exact genre, very ambient, sample heavy and "lush" but also dancable)
Keep It Unreal by Mr. Scruff (acid/nu-jazz I think?)
Frequencies From Planet Ten, Time Travelling Blues by Orange Goblin (two albums, stoner metal)
The Crazy World of Arthur Brown (by The Crazy World of Arthur Brown). (Psychedelic rock with rnb/soul-style vocals, also possibly one of the first narrative-based albums)
Ziltoid the Omniscient by Devin Townsend (prog-metal, one of the greatest albums of all time)
And if you want the heaviest album I've ever heard, try Snailking by Ufomammut. It's... It's something else. Basically a mix of doom and stoner metal but with sludge metal effects. Best way I think I can describe it is if Pink Floyd had been a doom metal band addicted to Lovecraft. It's trippy in a lovecraftian kinda way.
Anyway, gonna cut myself off here.