Hi Everyone,

I was able to go back early in the afternoon and refind this empid (~1:15pm, initially observed around 9:45am).  I got clean looks for a minute (but didn't know which subtle cues I should've been looking for), but was fortunate that it was singing still.  It only sang for about 2 of the 10 or so minutes I was there.  Here's a recording (that's a plane overhead for the first half of the recording, the last 15 seconds or so are very clear of the bird's song/call).

ftp://ftp.cs.umd.edu/pub/farrell/birds/Empid_13Jun09.mp3

I'm eager to hear what you all think it is... :)

Good birding,
Ryan Farrell
College Park