#2
I dont' know what song this is for, but what you need to do is:

Tap the 20th fret with your picking hand and pull your finger away from the fretboard (with a down and outward motion) while your fretting hand stays on the 12th fret, hammers on to the 13th fret, and then pulls off to the 12th fret. Obviously you need to do this twice.
#4
Quote by GorillaSalsa
I dont' know what song this is for



Quote by whoisthisagain
One Version 2
?

Aha.