The 2005 Sounds of the Underground festival tour was about as decidedly “un-funky” as they come. Equally put off by the lack of anything remotely “in a pocket”, Per Wiberg of Opeth and Jean-Paul Gaster of Clutch set up shop outside the bus trailers and sent an open invitation to any like-minded musicians. Shortly thereafter, they commenced to fill the void. All told, this happed only a few times, but when it did, great spontaneous jams were pulled from the aether. Read more on Last.fm