To Nissan: I heard b’shem a gadol (not one hundred percent sure if my memory is correct) that folk music/sixties was about the end of it as far as the goyishe music being redeemable.
And this is something someone should be able to verify, because it is well known: another gadol said that you can tell kosher music from not, depending on how it makes you move, either swaying right to left kumzits style, or other ways.