If you don't know Shrinebuilder, shame on you. They are the very definition of supergroup. The lineup: Scott Kelly of Neurosis, Al Cisternos of OM (ex-Sleep), Dale Crover of the Melvins and Scott "Wino" Weinrich of Wino (ex- St. Vitus, Spirit Caravan, Hidden Hand, Place of Skulls, etc etc). The sound: Neurosis meets OM meets Melvins meets Wino. Doesn't get much simpler than that. You can hear elements of all the players other bands in just about every song on the album. I believe they all sing as well. It doesn't sound like 4 bands mashed together though. It's cohesive. It has flow. And it's (as SYL would put it) heavy as a really heavy thing. However, it's not oppressively heavy. i.e. Sunn O))), Sloth, etc. Ya know, stonerdoomgaze heavy.
I really hope this collaboration isn't a one-off thing. They work really well together. All parties are so prolific, it's a wonder they even had time to do this. But, if they did it once, there's no reason they can't do it again. In the meantime, I'll be building my shrine.