There's precedent -- not a lot, but some. In 1996, the California doom metal trio Sleep put together Dopesmoker, a whole album that consisted of one slow, repetitive, atmospheric hour-long song. London Records, the band's label, had no idea how to sell it, so it stayed unreleased for three years; a smaller label finally released it years after the band's breakup. These days, the band gets back together every so often to perform that albums in full at festivals. And metal, like jazz or experimental, is one of those few genres where people take themselves seriously enough to record really, really long tracks and then to release those tracks as albums. In the past, people like Jesu, Pig Destroyer, and Boris have done it, as have non-metal types like Brian Eno and Jim O'Rourke. Still, I've never heard anything quite like Mirror Reaper, the overwhelming, suffocating, brain-rearranging new piece of music from the Seattle drone-metal duo Bell Witch. Its one song is 83 minutes long, and those 83 minutes are enough to fuck with your entire concept of time.