When I say empty spaces, I mean I would read a review about a band, or an interview in a zine that would pique my interest. I'd start looking for more information about that band, or the members of that band, and build a little spiderweb of references that took me from scene to scene and show to show over a period of two or three years, almost invariably to end with
1) No Music still available through any sources I have access to
or more likely
2) No recordings ever made.
