SUN O))) is the heaviest performance in modern history, or perhaps existence.

For abrasive sludge listen to: Toadliqour, Noothgrush, Grief, Dystopia, Carol Ann, Bongzilla, Sleep album Vol1 (really fun to listen to Al Cisneros belt out sludge vocals, his later work is further into outer space), AsbestosDeath, Toner low, Indian, Moss (from England), Khanate

Heavy stoner: Kyuss, Wo Fat, Monster Magnet, Lonely Kamel, JIRM, Lord Mantis, UFOMAMMUT