Probably the easiest guitar tune in the world to play is Horse With No Name by America. It consists of two chords, Eminor (two strings, one fret) and D, altho I played it with Eminor and Aminor, lifting off the g-string on the upstroke.
This site describes it a bit differently, but same results:
http://www.guitarnoise.com/lesson/horse-with-no-name/
As does this:
http://www.accessbackstage.com/america/cord/cord005.htm
It's also very easy to sing as there is little variation in tonal scale, making it adaptable to almost any voice.
Oops, guess she won't see this.
