Watched a a very active and vigorously singing Tennessee Warbler for some time at MLK Park, Jackson Rd, Silver Spring.  That's where I go to see  Orioles.  The warbler song was a bit different from what I expect from a Tenn Warbler.  More 3-note phrases, few 2-note phrases.  The first part of the song could be described as almost a staccato Yellow-throat like song.  

Oh yes, I did see both orioles.

Cliff Comeau
Beltsville/Calverton