It has a level cap (of 25?) so you can't just pull all of dreadlands, and also you didn't prove that you couldn't re-mez mezzed mobs with it. See this:
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However, it has been my experience, (albeit a limited one), that even with a constant singing of this song, the lulled baddies will still be "awake" enough time to deal out quite a bit of damage to the bard.
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I take this to mean that passively keeping the song on won't be enough to keep mobs permanantly mezzed (since it only mezzes them for around a tick), but if you spam click the song then it will work. This is consistent with what other people have said in those comments.
There seems to be enough evidence that it could only mez up to 4 targets at once (at least at some point) but does that mean it was a pbae or a targeted ae?