It's kind of weird that 3.19 was the only track that didn't get a real title, not sure why it's listed as " 汎用BGM-B" when there isn't even a " 汎用BGM-A."
Edit: it looks like there are a small handful of unreleased tracks so that might explain the "B" in the Generic BGM. If I were to make a guess I'd say this would likely have been "
Generic BGM-A"