Solo Part 4: Harmonizing

Harmonizing is a common way to spice up a metal solo. Typically, bands like Iron Maiden have used this a lot. One of the most common ways to harmonize a guitar part, is by adding a second guitar playing the same lick a third up.

So how do you know where this third is? Well, this is where scales are very useful. If you stay within the scale, you can just go up two steps and there's your fitting harmony.

This doesn't ALWAYS sound good, but in this example it does.