Ok so i keep looking at it, its not a crossbow, or a wrist bow because its attached to the actual bow, HOWEVER, a 6 stringed harp is rather stupid and in the position its at it would be rather impossible to play. I believe we are forgetting that FF weapons are usually now practical, it may just be another pointless attachment to make it look *cool*

Now as far as Bard goes, i welcome it, though i would definitely prefer a lute and i hope they would bring a vast majority of music to the table rather than 1 5 second song that plays every time you use to bard skill, like i've seen in many other games.