#3
The only thing i can say really is it's pretty much a minor i think. most the stuff he plays has a minor in it. it reminds me of street spirit by radiohead actually. so check the tabs for that if you want a little help.

Soloing would be the 5th aminor position i guess?
#7
Sounds liek there's a C in there. And A minor. the fingerpicky bit he does is based around just holding down an A minor open chord, and hammering/pulling off. He hammers on to 2nd fret b string a lot too.

Thats all i really know man.