I was at thier show in hartford as well, it was amazing.
Anyway, i do remember them playing music over the loudspeakers before the concert, I cant remember everything they played but they did play one of my favorite Trip-Hop artists:
U.N.K.L.E, the song's title is ""Eye for an Eye" from the album Never,Never Land. You can download it from iTunes. Its a great album and i strongly recommend anyone who is a fan of Coldplay go out and pick a copy up, alot of Coldplay's contemporaries have preformed with U.N.K.L.E (Thom Yorke of Radiohead, Iann Brown of The Stone Roses & Richard Ashcroft of The Verve)
Hope i helped you find what you were looking for, and many thanks for posting the setlists!
(i loved how Chris sang Politik: "I give me concerts i can play, give me Hartford USA") :)