Harp

Swinging it plays a note, and the pitch depends on how far from your character the cursor sits. Click on yourself for the lowest note, click near the top or bottom edge of the screen for the highest, and everything in between is spread evenly across that distance. It only lands on whole tones, so you get a plain two octave scale with nothing in between, which is enough for simple melodies and useless for anything chromatic.

It does no damage and has no other function, so its real purpose is to become the Magical Harp, which is a genuine weapon. The Wizard restocks it, so there is no reason to hoard spares. Hang one on a wall if you want the party trick.