Play a Harmonic: A harmonic is easily pulled off of the 5th, 7th and 12th frets, so we will use those for this tutorial. Other notes may require an effects processor to isolate the overtones. To play a harmonic, place your finger directly over the fret. You finger should be touching the string, but you should not be pushing down on it. Pluck the string and immediately remove your finger from the string. A long, high-pitched sound should occur. This is the harmonic overtone.