I'm sorry, i saw "sing to them" and my mind immediately went to that terrible "Chicken Attack" video out of Japan??? If you know what I'm talking about, you know already not to follow the link. If you don't, i apologize for sharing it.
Curious how you got the feet to cooperate?? I've had generally good results processing so far, albeit considerably older birds, but could not successfully peel the outer layer off the feet so I could throw them in the pot with the carcass, neck, and wing tips.