alright, my bad. i guess the other example off the top of my head that i can think of is jackson browne and glenn frey co-wrote "Take It Easy," and both have their own recordings. regardless, i'm guessing that's what is going on with RR and FH.
i just came back to edit my original post to say that this happens all of the time too...sorry about that. you beat me to fixing that...
at least to me it seems that this song was sold twice to two different bands. which could be fucked up if neither band knew this. This also happened with that Kelly Clarkson and Beyonce song that used the same composition for their singles. the dude who wrote it got exposed but i'm not sure what happened after that.
whether if the bands are good or not(what everyone else is saying) is purely just opinion and not the point of this whole debate.