@WiredDifferently I am trying to figure out the catalog thing. I have purchased the same CD three times. I felt lucky to find it, each time. Nothing at all wrong with the first disc.

With respect to cataloguing compilations, I have a section for continuous DJ mixes, electronica/EDM not mixed, soundtracks, themed tributes, holiday themed, and other general compilations. I think there's a section for compilations based on decade or year--I went through 70s and 80s nostalgia pretty hard core.