She's 83; her eyesight is starting to go.

In most cases, however, the ל prefixum indicates the author, and there are historical grounds for the view that other historical persons than David, distinguished likewise in the domain of sacred song, were by this designation to be put in the same relation to certain Psalms, and that it was by now means the intention of the authors of the superscriptions to make David the author of all the Psalms.

Darest thou […] divine his downfall?

I'm going to body-slam your client at trial until he wishes he had been more cooperative and you wish you had been more persuasive.