Telegraph, a band from D.C., suprised me with their funky sounds and awesome hooks. They had a great setlist, one song I can't even find the name of, yet plastic was said a lot in the song. Their description here on last.fm is also lacking.
Gomez, who plays "How We Operate" off of the Grey's Anatomy Vol. 2, performed this song last. Other than that, the lead singer seemed pretty stoic yet has a great gravelly voice. It reminds me slightly of the Foo Fighters lead singer, Dave Grohl. You should definately check out the songs where Ian Ball, the main singer of the group, is doing the vocals.
Soon, O.A.R. took the stage and opened with a jammin' version of '52-50' and continued to play practically every track from "Stories of a Stranger" including, 'Lay Down', 'One Shot', and their new single 'Heard the World'. It was truly 'old school'/college rock O.A.R. when Marc Roberge busted out with 'Crazy Game of Poker', 'Anyway' and "34th & 8th"'s, 'About Mr. Brown'. Marc actually messed up the lyrics to 'Anyway' and sang the third verse first, then continued with the gnat and skipped over the mouse part (which is my favorite). He said he hadn't played it in a while. The lighting for 'The Stranger' was really awesome, Jimmy, the sax player came to the edge of the stage and the lights hit him for the first jamming guitar picks before the singing. Two really great special songs O.A.R. played were 'Black Rock' as they are from Rockville, MD (less than an hour away from G. Mason) and 'I Feel Home'. Honestly, I've heard O.A.R. was better back in my early college days, playing huge outdoor venues to wasted/high kids. That would certainly account for a more chill atmosphere but I appreaciated my first O.A.R. concert all the same. It would have been perfect had they played 'Hey Girl', 'Coalminer', 'Nasim Joon', and especially 'Night Shift' but 'I Feel Home' practically made up for all of that.