IN EARLY 1972, the final year of Träd, Gräs Och Stenar’s first phase, the dual-guitar quartet played a pair of shows in a radical community space in Gothenburg. Named for trees, grass and stones, the band had become interested in macrobiotics and sustainable agriculture, ideas they took on tour through exhibitions and talks alongside their psychedelic rock sets. “We became missionaries for this belief system,” bassist Torbjörn Abelli wrote 40 years later, “which … we believed would solve the major problems facing humanity.”
That, of course, hasn’t happened. But half a century later, their alternately hypnotic and explosive rock – borne of liberation philosophy and communal welfare – has enjoyed a renaissance. A string of reissues and excavations culminated last year in an engrossing 400-page tome, A Collective History. After…