The Black Friday Edition of Record Store Day promises another batch of incredibly interesting and collectable vinyl.

Originally unknown to exist, The Grateful Dead is releasing a live acoustic show recorded on April 18, 1970 at the Family Dog at the Great Highway concert venue in San Francisco. It's an 80-minute, 17 tune compilation that features originals and covers, in addition to six solo works from Pigpen.  In an interview with Rolling Stone, David Lemieux, The Dead's archivist, said he received a call from Carolyn Garcia saying she’d found a small box of reels among Jerry Garcia’s belongings. There, in the box, was the tape of this show.