Watch Exclusive Doc on Mastodon's Deep Ties to Neurosis' Scott Kelly

Mastodon and Scott Kelly go way back. Sure, any fan of the Atlanta prog/sludge quartet knows that the Neurosis singer-guitarist has guested on six of their songs across their last six albums — songs that Mastodon will play with Kelly each night of their current European tour. But the artists' ties runs even deeper: When Mastodon first came up with their band name, they turned to Kelly for the seal of approval, and he and drummer Brann Dailor bonded intensely during the making of Crack the Skye, having both suffered similar tragedies. In this original documentary, the members of Mastodon and Kelly reflect on their shared experiences and look ahead to future collaborations.