"Don't say something like "Well that isn't sung often","

DrugCrazed, that's a good point. And I think as others may have already said, many of the so-called 'oversung' songs, you actually never hear sung at all.

Now if you've been going to clubs for sixty years you may have heard them a lot, but if you've only been going since such 'oversung' favourites have long since fallen out of favour, the likelihood is that you'll only ever get to hear parodies of those songs 'oversung' today.