With the Grateful Dead turning 60 this year, you may be able guess how many CDs are included in a forthcoming epic boxed set of live shows from the band’s heyday. There’s a clue in the 50-disc package that came out for the band’s 50th birthday 10 years ago.

Every long, strange trip has to begin somewhere. For the Grateful Dead, that moment came in 1965, when the group began playing shows as The Warlocks before changing their name. And while the group’s successor,