Hello,
Just an FYI there was a vocal Eastern Meadowlark at Southwest Area Park to in lower Baltimore County. I took a quick video if anyone is interested. The bird was moving between small standing trees near the stream bridge, en-route to the boat launch. Vocalizations were constant. I initially couldn't see the bird for the life of me but then it popped out in the open. The call in the video was all it was doing.

http://www.flickr.com/photos/thrasher72/5395757009/

Jon Corcoran
Catonsville, MD