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 now attract prices among collectors that are totally out of proportion to the music's rather average worth. Indeed, some of the gatefold versions of the original LPs are valued as high as 1,500-2,000 pounds. You don't have to pay that much to hear the music, as it's now been reissued more than once, as have some other odds and ends that the band and other projects of their members recorded, from both the 1970s and the 1990s. AMG.