How do you get the effect that ZZ Top uses in the guitar solo in La Grange?!

Question: How do you get the effect that ZZ Top uses in the guitar solo in La Grange!?

It's almost like a pitch effect of some sort!. It's used in Wanted Dead or Alive's (Bon Jovi) solo, also!.Www@Enter-QA@Com

Answers:

Pinch Harmonics!.!.!.
There are millions of tutorials on how to do them!.!.!.

http://youtube!.com/results!?search_query=!.!.!.Www@Enter-QA@Com

Same answer as "semalfni2!.0"

It's also helpful to have Billy Gibbons remarkable dexterity !!
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