Need ID Help for this one.

[William M.]

Its size is getting down in the hummingbird range. He was singing like crazy, must have thought he was Pavarotti.

[Kim]

Hi, William.

Could be a House Wren. I posted a couple of pics of what I thought was the House Wren the other day. The voice makes sense. I sat in a small wooded area and watched a couple build a nest (pics) and the singing was incredible. Here is a link to the Cornell page about it and the song is there. It is what convinced me most that I was correct in my ID. I have been back twice to watch them. Very neat bird.
http://www.allaboutbirds.org/guide/house_wren/id