There are many song lyrics questions that are indeed a duplicate of the rickroll (the recently deleted Australian national anthem is another example.) On the other hand there are some that aren't.
To me, songs that require numbers to be calculated / displayed in a different way to other questions are definitely not duplicates of the rickroll.
Also, this latest question "Work it harder, make it better" is not a duplicate of the rickroll, because the entire lyric is composed of the following paragraph, repeated with various omissions and, uniquely, rearrangements.
Work It Harder Make It Better
Do It Faster, Makes Us stronger
More Than Ever Hour After
Our Work Is Never Over
It was closed very rapidly as a duplicate of the rickroll, and, less than an hour later, has three reopen votes.
Before close voting I always read questions in their entirety, to be sure, and I suggest we should all do the same. Rather than close voting a song lyric question because it's "just a duplicate of the rickroll", in this case it makes more sense to upvote, precisely because the OP has found a song that isn't just a duplicate of the rickroll.
EDIT: I'm disappointed that many answers to "work it harder make it better" have followed similar techniques to the rickroll, instead of taking full advantage of the structure of this particular text. Nevertheless the opportunity was and is there, so I feel it should stay open. To illustrate this, my own answer in Ruby is currently in second place (behind Peter Taylor's Golfscript answer) as a result of taking advantage of the strong patterns applicable to this particular song.
I think we can draw a parallel with ASCII art, where it's important that there is some kind of pattern (not too simple, but not too random.) Compression of text without a pattern is not interesting, as it relies on standard techniques. But a text like "Work it harder, make it better" has sufficient pattern to it to benefit from non standard text-compression techniques. And this is the critera we should apply to similar questions.
So, just I would hate to see us closing ASCII art questions, I would hate to see us closing those text compression questions whose structure means they can benefit from non-standard text compression techniques. To be clear, if it's a straight text with no pattern I would agree with closing it. But let's keep an eye out for patterns before we close.