I was at a Lightfoot concert many years back. A nice middle-aged lady asked Gordon if he would do "Pony Man," once a favorite of her young son, who had passed on prematurely. Though Gordon had most certainly played it many times in earlier years, he could not recall it well enough to play it for her, even at such a moment. He was very apologetic and asked her permission to substitute another tune. I thought he handled it well. I have no doubt many of us have had a similar experience.