The British band Dark made one extremely rare album in 1972, Dark Round the Edges, that melded the hard guitar rock of the era with a jamming sensibility on multi-sectioned long tracks with improvised-sounding passages. Though hardly brilliant, the record has some interest as an effort with metallic hard riffs that uses more musical intelligence than much heavy metal and hard rock of the era and is rawer in its execution and production without being lo-fi. As is the case with some albums pressed in very small quantities (only about 60 were issued in 1972), original editions no...