How can I semi-tame/socialize a crow Not to be a pet but to trust me

Once, a few months ago, I was working in the yard and a nearby crow was squawking, making a lot of noise. Just playing around, I started talking to him in a friendly tone. To my amazement the crow flew down and landed on top of a 6-foot fence just out of arm's reach. I kept talking to it and it kept listening and looking at me, turning its head from side to side. I left briefly to go in the house to get some food for it as a treat, but by the time I got back, it had flown away. For it to do this, I assume that someone must have at least tamed it to some extent.

I was so thrilled by this that ever since I've talked to the crows around my house (there are plenty of them) hoping that it will happen again, but it hasn't. I'm sure that my neighbors must think that I'm crazy by now. :)

What I'm asking for here are tricks I might use to tame one of these wild crows in the same way. I don't want to make it a pet; just to get it to come to me for treats and not be afraid.

First of all, put out a bird bath. Birds love to take baths and this is one way of attracting them. Make sure you scrub the bowl out often to keep it clean and refill it when needed.

Reinforce the visiting by putting out food.

Crows are "Opportunistic Omnivores". In other words, they are just like us and eat everything, however corn seems to be about half of their diet when it is available.

They also eat bugs and earthworms along with a ton of other things.