Bell Harmonics

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Lift up the high E string with a finger on your fretting hand, push it up and over the B string, and back down to the fretboard. The high E string will be laying across the B string. Now pick both strings at the same time. It creates a kind of ring modulation, like in a bell. It never fails to raise eyebrows in a group of musicians, and the inevitable question, "How'd you do that??"