Lets not leave out the church organ you wait on some black lady to hit a chorus, instead you end up with Plant, release a wonderful love song.

They truly were shades of light and dark. Such a remarkable band, and while there are many other bands, none can ever cover the range and territory Zep did. That is just fact. You may not like it, but most bands are really one trick ponies. They can play a genre really well, but get them out of it and they cant do it.