#1
Hi. That's the third part of the lightning strike, from hundred million suns album. It is not in the list, and it's such an amazing song!
I think it may be played with chords, but they play it with two guitars. I think it's not very difficult.
Thank you.
#2
It's basically just D, and G over and over again

the other guitar does tremolo picking on the high E string around the 12th and 7th frets.