I wanted to make a strong mental note. But the acoustic cover might be it. I think the french horn thing was right before they went on. I thought I heard an accordian at some point in that period. I also thought there was some piano, but it was noisy and didn't realize I liked it till it was too late.
There were 2 acoustic songs with a female singer, one was As I Am and the other was Pull Me Under. The other ones with horns and violins (or whatever.. I don't know) sounded like parts of Octavarium and some parts from Metropolis 2. Hope that helps...
The show was indeed fantastic, Jordan (with his synth ax) dueling with JP was pretty hilarious. They did more than just play their music, they put on a hell of a show, the best entertainment!
I'm so excited to see them again, fortunately I only need to wait until Sunday.