Let me re-phrase my question somewhat. To those people who listen to only “Jewish” music, how can you tell? What distinguishes it from “non-Jewish” music?
You know, just because I can’t give you an all encompassing definition, doesn’t mean I am not able to recognize it as a practical matter in a sufficient way.
I can’t define stainless steel either, but I know what it is.
And I certainly can’t define obscenity, but I know it when Justice Stewart sees it.