Can somebody explain to me the harmony guitar part like the guitarists form Iron Maiden used to do? The example is shown in the tab below from song called ‘The Evil That Men Do’. It is where the 1st guitar play ‘this’ part and the 2nd guitar play the ‘other’ part. What I understand is that the 1st guitar play the usual riff while the 2nd guitar play it b3 higher than the root note.
Am I correct? If I’m correct, is it the only way to harmonies (?) it. Or there is any other way? And it is played on the E chord. Do we need to change to other chords as when the harmony involved? Thanks.