Awesome quiz! I actually have a quiz extremely similar to this in my unpublished group so I will have to tweak it because I enjoy yours better! 5 stars and nomination point!
The only fix I recommend is including "Ramble On"... if I am not mistaken it appears on "Led Zeppelin II". And the Zeppelin fun fact for the day is that the track "D'yer Mak'er" is actually pronounced "Jamaica" but with a British accent.