This is the biggest one yet! SWTF IV has just announced that the mammoth merchants of stonerdelic doom themselves, SLEEP, will be headlining this year’s fest! If you didn’t have this Tucson fest on your calendar already, I know you’re penciling it in now! SLEEP’s music was meant to be heard in a state with the same landscape as Mars. There are still a few more announcements to be heard, so stay tuned in…