Sturgeon's law (90% not 95 BTW) is often overused and misused beyond the point of it's original intent. Music being 'good' is not something that can be objectively measured and therefore which 90% is the crap portion varies by individual (there is not even consensus among 'qualified' persons). The more accurate way of putting it, within this context (which has nothing to do with the original intent) is something like: everybody thinks 90% of anything sucks; it's which 90% we disagree about. Not quite as succinct and nihilistically cool (which is why it gets so much use), but miles more clear and logically airtight. The original intent was to defend the newish genre of Sci Fi literature from critics who were dismissing the entire genre as without merit based on the 'worst' examples of it. His point is that any category of work (not just art forms, but consumer goods etc) has approximately the same proportion of poor quality examples and therefore those critics were logically incorrect in drawing conclusions from a few examples, selectively chosen. It does not work to use this 'law' in isolation to one particular form to show how most of it is crap (i.e. originals vs covers - 90% of those suck too, as previously mentioned).
Going further, there may be some examples that seem "universal" (such as the Kinks tune mentioned above - hell, I dig it, not sure I'd want to cover it, maybe in a reinterpreted way, but not straight up) but even this is not the case. There is no definitive 'good music' category, nor even selected undisputed members (unless your sample, as regards those you are asking, is biased in some way*). There are people out there who still don't acknowledge Rock in general as potentially good music. ... and then there are others who can't grasp how anyone could dispute the divinity of Led Zepplin.
I'm not even sure one can even classify works definitively the other way - worst; sucks. No matter how bad something is, some asshole out there digs it and often what experts or more discerning persons might consider pap, is in reality the most popular and well-liked; e.g. pop tarts and boy bands.
* all the above said, a skewed sample can be relevant in that it could define your target market. Drunk single middleclass 30-somethings down the pub for example. I'd give you 1:1000 odds that your grunge cover band would be a hit.
