A strange melody seems to emanate from within this weapon.

A harmonizing weapon accompanies you in song if drawn, granting a +2 competence bonus on Perform (sing) checks. In addition, if you hold a harmonizing weapon when you begin a bardic music effect, the weapon can continue the effect for you, allowing you to focus on other efforts. One round after you begin a bardic music effect that allows or requires continued use or concentration (including inspire courage, countersong, fascinate, inspire competence, inspire greatness, song of freedom, and inspire heroics), the weapon picks up and continues the performance flawlessly for 10 rounds, until you start another bardic music effect, or until you command it to end as a swift (mental) action.

Prerequisites: Craft Magic Arms and Armor, ghost sound, bardic music.
Cost to Create: 1,000 gp (plus 300 gp for base item), 80 XP, 2 days.