Actually I'd be surprised if Rap Genius is any good for "song meaning" queries. Will it give you information? Probably. Will that information be accurate? I'm skeptical.
I've done a few spot checks on Poetry Genius, at least, and the annotations have consistently been either wrong or irrelevant, even for works that are well documented (e.g. The Waste Land).
My guess would be that if Rap Genius users aren't getting it right when large bodies of secondary literature are available, they can't be doing very well with pop music lyrics either. I could certainly be wrong, though.
They have verified artists program (http://rapgenius.com/verified-artists) where artists pop into explain the lyrics themselves. It might not be perfect, but there are only so many players in the "song meaning" arena & I bet RG is pretty high up there.
I've done a few spot checks on Poetry Genius, at least, and the annotations have consistently been either wrong or irrelevant, even for works that are well documented (e.g. The Waste Land).
My guess would be that if Rap Genius users aren't getting it right when large bodies of secondary literature are available, they can't be doing very well with pop music lyrics either. I could certainly be wrong, though.