Progressive/Avantgarde Death Metal from Sweden. Their debut from 1992.  

PAN-THY-MONIUM was formed by scene legend Dan Swanö (Edge of Sanity, Nightingale, Bloodbath) and members of Ophthalamia to indulge in - and push ever further - the most bizarre and avant-garde boundaries of death metal. An opening track that's over 20 minutes long, saxophone freakouts, wordless vocals, constantly shape-shifting song structures full of swampy riffing and careening blastbeats...everything but the kitchen sink goes into Dawn of Dreams. Although it caused confusion upon its original release, the album later became a cult classic with many underground fanatics and other weirdos, especially fans of Swanö's vast body of work. Experience it again (or for the first time) and blow your mind!
 
Osmose, 2018.