Autoharp is about as easy as it can get. Harp a chord and sing along. At risk of insulting real players, I've said it...easy and user friendly, push a button, strum and this beautiful sound emits. Very affordable instruments. Since the autoharp has not yet been suggested, I guess eric the orange is from the Britsish Isles where autharps may be hard to find. There are plenty to see on E-bay. Just be sure to buy a chromatic tuner for the 36 strings.
Mudjack