Alright, sound striker bards get this...
Wordstrike (Su): At 3rd level, the sound striker bard can spend 1 round of bardic performance as a standard action to direct a burst of sonically charged words at a creature or object. This performance deals 1d4 points of damage plus the bard’s level to an object, or half this damage to a living creature.
From the way it's worded, there is no attack role, and it appears you can use it on ANY object. Such as an attended, held item, like a wand, ring, headband, etc. These are all expensive, powerful fragile magic items. Can you use word-strike to sunder equipment? It doesn't seem to say you CAN'T, but that seems very powerful.