If you are into birds like I am you will love this website with tons of info on each bird. You can click on the sound button to hear them singing. http://www.allaboutbirds.org/guide
It's funny when I play certain bird sounds, that are in my area, my cats come running looking for them. Especially the Chickadee. Here's a pic of one that I took a couple of months ago. Cute little birds.
I'll never forget one year I found a baby chickadee was stuck inside of one of my bird feeders. The feeder was almost empty and the only way he got in there was through the feeder hole. I don't think he was in there very long. I just opened the top of the feeder and he flew out. Thank goodness I was home that day.