I see what you are trying to refer to here
There is a guideline on using right single quotation marks (curved ones) prior to straight ones, but this particular one is not quite the case, because it is not the case of apostrophe usage at all.
While usually ‘n’ is a shortened “and”, here it is a word play, ‘o’ does not really stand for anything, it only divides “Rock” and “co” I guess. Though I think the rule on shortened “and” would work anyway.
Here they use different apostrophes for the one before and after “n”, and here they are treated the same way (well I see it is not a very reliable source of information).
That is why I ask people of MetaBrainz to help me out.