In my previous thread I asked What makes a great song in your opinion? Well in this thread lets show examples of what a Great Song is.
My First example is Purple Rain by Prince,
To me this song has it all Great Lyrics and Melody that create an Emotional Response and a Kick Ass Guitar Solo
Here is a youtube link to the original version:

http://www.youtube.com/watch?v=qmKvUeIz44w

and here is a link of a cover done by Tom Jones with Sir David Gilmour on guitar:

http://www.youtube.com/watch?v=vZSfxiM-pYk