that kids playing is pretty bad in my opinion, he has no chops, just going spazzy
Your minor power chord as someone already mentioned would be say 5 fret on the A string and 3 fret on the D string, that would be D minor in standard tuning and represents a minor 3rd interval. (In the "key" Im headed in here, which is F major, this can be slid up two frets and becomes an E minor)
The major power chord would be... say... lets move down to the 3rd fret on the A string & 2nd fret on the D string, this is C major and represents a major 3rd interval.
Drop down the fretboard two more frets use the same major 3rd interval (1st fret A string open D string) and you have a A# major (B flat major, Im not very good on key signatures)
Then there is the inverted 5th which has a fat sound, that is a straight bar between any two strings (excluding between the G & B string), but the root is on the higher string. I like to use these on three strings. So lets go back to a normal D power chord, that would be 5th fret A string, 3rd fret D string, this represents a perfect 5th interval, but add the lower octave 5th by baring your first finger on both the 5th fret of the E & A string, your root is in the middle with a droped 5th and a raised 5th, very fat sounding.
now your ??? someone would have to help me here but its either augmented or diminished power chord in this particular key we are already going on would be 1st fret A string, 2nd fret D string, here I only use it and dont really know what it is, augmented if memory serves me and this is staying in key, which I dont always do.
another thing, take your standard perfect 5th power chord and drop your lower finger one fret. In the key I was just in that would happen I think on the open A string and 3rd fret of the D string. So say you are playing a A# or B flat power chord (1st fret A, 3rd fret D) and lift your first finger to open up the A. This must be some sort of 7th because thats what a 7th does is flaten the root.
This is the edge of my theory knowledge and may not pertain to your "black metal" feel. Im old school metal, blues and jazz, and there is much theory I dont know either, I just play what works for me, but with metal I primarily use just two-three string chords to keep things clean for riffs. Rythmns or picking or jazz and blues is a whole nother ball game and I cant explain any of that.
Good luck following along without tab but if you go slow you might get it. Its hard to explain. Seems one of the key things in metal is use of the one fret interval appropriate 4 fret interval and even better for darkness drop one fret and one set of strings for the "wicked" sound which is where that, either augmented or diminished thing comes in.
Sorry its the best I could do and no one else kicked in so... give it a try
