The Grateful Dead’s live album Reckoning (released 4/1/81) is a prime example of the new-found inspiration the band was experiencing with the enlistment of Brent Mydland into its ranks. Recorded in the fall of 1980, some eighteen months after the keyboardist/vocalist/songwriter joined, this acoustic collection and its electric companion piece Dead Set was as close as the iconic band came to celebrating its fifteenth anniversary. Contained in expanded form as part of the ornately-designed box set Beyond Description: Grateful Dead 1973-1989, a two-CD set illustrates how the Grateful Dead benefited from their reconfigured camaraderie. An understated but hardly less amazing amalgam of originals and roots of their folk/country/bluegrass originals, this compendium may be the sleeper of that second massive box set. Enlivened accordingly, the rest of the band plays with a combination of savvy economy and exploratory zeal.