This guitar trick is a variation on artificial harmonics, which itself is a variation on natural harmonics. The natural harmonics are most commonly played on the 5th, 7th, and 12th frets. To play these, you lightly press the left hand on top of the fret without pressing the string to the fret. Then, you pick the note. To make an artificial harmonic, you regularly fret a note with the left hand and then use your right hand index finger to lightly press on that string twelve frets above the fretted note. Then, you pick the string. With this technique, you have to hold the pick between the thumb and middle finger. Finally, to play harp artificial harmonics, you alternate plucking a note using the right hand ring or pinky finger with picking artificial harmonics. This creates a harp-like sound! This technique works well when you can fret a chord using four or more strings without repeating any notes. The video below shows the great guitarist Lenny Breau describing how to accomplish this:
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