Pinch Harmonic
"Pinch harmonic" is a typical guitar scream. It is often played by the guitar players to rip into the solo and to play one or more notes that simply scream and sound stunning. The rules remain the same but this time all the action depends on how you pick the string.
While playing the 'pinch harmonic' guitar player not only picks note as normal, but also lets his thumb brush up against the note precisely after he picks it. The thumb is setting up the node of the "harmonic" and forcing the strings to vibrate with the desired harmonic series. If you crank the gain and treble up, after employing the technique in proper way, you will always get a screaming harmonic of some kind.
As with other harmonics you need to fine tune the exact position you are utilizing to strike the melodic point, and you can even exchange between different harmonic types in between notes. Since Pinch Harmonics are performed near the bridge, we are selecting from the higher harmonics, so we find high notes. Some higher harmonics also include inharmonic components, adding to the scream. A lot of the possible actions are here within a small space - we get more because the guitar is artificially sensitive to the higher order harmonics as be having upped the gain a lot.
Tap Harmonic
A "Tap Harmonic" is just like an "Artificial Harmonic"; the divergence between them is that the "tap harmonic" uses a single action- to do a tap, instead of separately touching and pulling the string. For this you need to tap the string softly so that it very briefly strikes the fret underneath it and remove your finger very quickly. The tap puts the string in vibration and at the same time creates the node in the right place - so of course you need to tap the string at the right place essential to set up the "harmonic" you want.
Whammy Bar Harmonics
Ultimately, the "Whammy Bar Harmonic" is similar to the "tap harmonic", the only difference is that while playing "tap harmonic" you select very high order harmonics, and there is no fret below the exact point you need to hit, therefore, you need to use a whipping action to set the string oscillating and deaden it in the right spot to set up the desired node.
That is why; "whammy harmonics" are about the most challenging "harmonic" technique. A great place to do this is on the G string between the 2nd and 3rd frets - depending on the exact place you whip. In this way, you can find 3 or 4 various harmonic series. Just remember that before you whip, push your whammy bar down, and after the tap release it and add a few vibrato - with this technique you can get some crazy screams.
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