Watch the Pinch Harmonics online guitar lesson by Jeff Scheetz from Rock Tricks
This is one of the trickiest techniques to master. It is something you really have to work at because it is such a feel thing. But listening to players, who use this - from Billy Gibbons of ZZ Top to modern day screamers like Zakk Wylde, will show you just what is possible. It is a great way to get different notes from the same place without moving your left hand, you just move your right hand harmonic and voila!!!