Fifty years on, the Woodstock Festival of August, 1969, is one of those rare pop landmarks that refuses to be washed away. It has entered history and lore as the last blossoming of flower power before the decade went dark—a triumph of communal energy and can-do spirit—and its golden anniversary arrives packaged with a commemorative bundle of nostalgic reveries, historical revisionism, unearthed treasures, and plaintive threnodies to Innocence Lost.

Barak Goodman’s long-brewing documentary Woodstock: Three Days That Defined a Generation, which opened in select theaters on Memorial Day weekend after premiering at the Tribeca Film Festival, emphasizes never-before-seen footage and audio testimonies from those who made the shlep. For those who prefer glossy scrapbooks as their hot tub time machines, lavishly produced keepsakes such as Pilgrims of Woodstock: Never Before Seen Photos (Red Lightning Books), featuring text by John Kane and photographs by Richard F. Bellak, and Woodstock: 3 Days of Peace & Music (Reel Art Press), the official anniversary edition assembled by Michael Lang, the festival’s original creator, immerse readers in those bygone days of good vibes.