Originally Posted by Darko

the most common are 3rds and 5ths. to do it find the note that you origannaly play it on. then go three notes over so like this

A

ABCDEFGABCDEFG

so to do 3rds go three over so it would be a C. Simple as that and it makes the iron maden sound. you can do it with everything 2nds dont sound good and 7ths are just shitty but every thing else is great sounding, try it.