Some of the seasonal "wands" Pat O'Gold sells (see her by the fountain in the Merchant District) are harps.
I was disappointed by the animation as well - I had anticipated something more musical like the charmer's mystical flute from the Mega Bundle or the mandolins from the Hoard of the Hydra packs. Waving the harp clumsily about as if it were a weapon just seems wrong (and at points in the animation part of the harp disappears inside my character's dress).
I bought one, stitched it, played with it a bit, unstitched it, and hung it one a wall - where it looks nice!
But hey, it is a whimsical seasonal item and it wasn't expensive in Crowns, so no big deal.