Sometimes when he's playing and one of his harmonicas is on its way out he'll offer to give it to the first person to identify the author of the song he's just played.
Finally, one evening I managed to answer both correctly and before anyone else and became the proud owner of a slightly used F harmonica, which I should still have around somewhere. Later on I mentioned this to Pam Murray, whose immediate response was,
Cool! Now you can clone him!