Just for the fun of it, I fed the word "harp" into the Bartelsby database (http://www.columbia.edu/acis/bartleby/) which accepts word(s) and finds them from all the books it has in electronic form:
These two quotes come from the Old Testament (54)
... We hanged our harps upon the willows.
... As for our harps, we hanged them up upon the trees.
These sound like Aeolian harps, which do hang and are made to sound by the wind blowing through their strings.
I don't know if you can make an Aeolian harp with a human breastbone.
The question of what kind of harp is meant might be entertained by the harp newsgroup. It is far less gory than the question whether a harp can be made from a breasbone.