ok, dissonance, shmissanance.
this is called unison bend. I was doing it all the time when i firtst learned it. I"ll explain the steps.
Usually the note you want to have this effect for is played on the high e-string. let's play an e on the 12th fret. play that e with your index finger. now, at the same time play a "d" on the b-string with your ring finger on the 14th fret.
Now, bend the note with your ring finger until the two sounds are pretty much in unison (same note). if they are out of tune you will hear this cool sound, which is actually from waves colliding. Another thing you can do now is keep that note that you just bent and play a g with your pinky on the 14th fret of the e string. it became a cliche, this whole "riff", but sounds pretty cool.
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