Explore “Scarlet Begonias,” from its trans-Atlantic origins (including the Dead’s surprising Bob Marley connection) to Cornell ’77 & beyond, featuring the Wall of Sound’s stop at the Hollywood Bowl (with more unheard Owsley Stanley) & a visit from Vampire Weekend’s Chris Tomson.

From “Loose Lucy,” the Deadcast jumps onto Dead tour in June ‘74, going under the hood of Phil Lesh’s new quad bass, behind the scenes at the tie-dye information booth, a private lunch at the Bank of Boston, & on a Mars Hotel-soundtracked summer road trip with Sonic Youth’s Lee Ranaldo.