Gail,
   The song you described appears to be the standard alternate song of Blue-winged Warbler that I frequently hear in Maryland.
--
Bob Ringler
Eldersburg MD


---- "Gail B. Mackiernan <>" <> wrote: 
> Hi --
> 
> As Clive posted earlier, we stayed on after he left and did the Maintenance Yard and Military Field, and added a number of birds of interest. Things are really starting to pick up!
> 
> Warblers: Black-and-White (3), Black-throated Green (1), Blue-Winged (5!, one singing an abnormal song - br-br-br-br-br, buzzzz-- but appearing normal BW),