Harfe is German for Harp
Spiel is used as a suffix to denote a natural note scale instrument, such as a Glockenspiel.
That combination of a harp and guitar is popularly played (or was) by a musician named "John Doan" and the instrument (which is a real instrument!) is called...
A Harpenspiel
Harfe+spiel=harfe-spiel, or, in German, after a compounding:
Harfenspiel.