Ramshackle Swedish folk, medieval jam sessions, home-spun hymns recorded straight to tape, and albums named after revolutionary communist bands: The world of Gustaf Dicksson’s musical project Blod may seem unbearably esoteric. But a little context helps; Dicksson is a spiritual descendant of Swedish Progg movement of the 1960s and ’70s — not to be confused with prog rock, it was a left-wing, anti-commercial music movement that encompassed a wide range of styles, from psych-rock bands to nationally beloved singer-songwriters. Blod is indebted to the mossier, more experimental ends of the movement, including bands like Träd, Gräs & Stenar. This is the anti-capitalist, DIY heritage which Discreet Music — the record store and label…