The National have been planning a Grateful Dead tribute compilation for years now, and next year, it’ll finally be out in the world. We already knew that Bon Iver’s Justin Vernon would be participating in some way, but now we know exactly what he’s doing: Jambands.com reports that Bruce Hornsby has revealed in a 2015-in-review Facebook post that he took a trip to Vernon’s Eau Claire, WI home to collaborate on a cover of “Black Muddy River.” Vernon has made no secret of his appreciation for Hornsby’s music — “Beth/Rest” is practically a love-letter — so this makes total sense. (Plus, Hornsby has already covered “Black Muddy River.”)

Other artists featured on the comp are the War On Drugs (“Touch Of Grey”), the Walkmen (“Ripple”), Marijuana Death Squad (“Truckin'”), TV On The Radio’s Tunde Adebimpe (“Playing In The Band”), Unknown Mortal Orchestra (“Shakedown Street”), Kurt Vile and J. Mascis (“Box Of Rain”), Perfume Genius, Fucked Up, Grizzly Bear’s Daniel Rossen (“Terrapin Station”), Phosphorescent’s Matthew Houck (“Standing On The Moon”), Yo La Tengo, Sonic Youth’s Lee Ranaldo, Stephen Malkmus, and Sharon Van Etten, plus the National themselves. Yeah, that is an insanely stacked cast of musicians.