The electric version of Layla is so great that I can't even listen to the unplugged version. In fact I don't much care for the unplugged version of any hit rock song. As long as we are talking about real covers of artists doing other artists songs, here is a great on of Otis Redding doing a cover of The Rolling Stones Satisfaction
Highway To Hell...."Jess". I figure some here might appreciate. https://www.youtube.com/watch?t=22&v=p7NNY3NKipE