I don't know, maybe I am just stupid, or the multi-country thing doesn't work clearly. I am currently trying to get a selection of bands that are not in the countries that are sorted alphabetical. Say if I want a band from Japan and Germany, I can't do that but only can go by single countries. I try to left click on every country I want included, but the search just incudes one and de-selects the other. Left control button will only select countries in a row, not the way I want, because it gets other countries I don't want in the way. If I am stupid please explain how to get those multiple countries selected.

Also, when is filter by Popular going to come out? Would that mean Encyclopedia 2?

Use ctrl + left click, then it won't deselect other countries.