I'm still new to bards and their gear so I'm not sure if this item got nerfed, or if there was some change in the way the instrument mods are displayed. But in the picture it shows Percussion Instrument: 28, the one I looted on my bard today says Focus Effect: Percussion Resonance 18.
Really disappointed me lol, I'm looking for a better percussion instrument, and already had an 18 from the thunderous drums of karana that drop in PoP off of an easy mob in BoT... You would think an item off a raid mob that is easily 50 times more difficult than the group mob, would have a better mod :(