These five-disc box sets issued by the German arm of Sony BMG are for the most part a fine way to reissue original recordings en masse -- unlike their American counterparts who do the sloppiest job possible. If you already have these classic '50s sides by Miles Davis with his first great quintet and with Gil Evans, then don't bother reading further. If you don't, pick up these sides with Kind of Blue and Sketches of Spain (the only complaint is that these weren't in this set instead of 58 Sessions and Miles Ahead, but there were reasons for that and some of them have to do with commerce). In any case, these are the extended versions of the albums when they were reissued definitively on CD in the 1990s and early 2000s. They contain bonus cuts not on the original CDs, the sound is warm and balanced, and each disc comes in its own case. The other cool thing is for the consumer: if you look around online, you can find these boxes dirt cheap, for about six or seven dollars a disc, which is cheaper than their domestic counterparts would be.