Eschewing the standard hits-sprinkled-with-rarities mix, this lovingly compiled three-CD, one-DVD collection is made up almost entirely of previously unreleased selections. The handful of previously heard tracks are obscurities along the lines of the group's cover of "Here She Comes Now," recorded for a 1990 indie-rock tribute to the Velvet Underground. But it's not the B-sides and compilation oddities that define this idiosyncratic set; rather, its spirit is captured in the bedroom demos, radio performances, and sloppy amateur video recordings that catch Cobain and cohorts developing from just another punk- and metal-inspired bunch of grunge rockers pounding away in the bass player's mom's living room into a band that defined an era. --Steven Stolder