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it will make it sound in key, not some much the chord business but by only using notes in a key it will sound better, when I listen to some of your pieces I just can't ignore it.
how does this help me make dubstep?
the interval from a C to an E is a third, from a C to G is a fifth, from a C to a B is a seventh. (as the b is the seventh note in the scale of C major)
in a triad there is always a minor third and a major third, in major chords the major triad comes 1st, such as C to E in C major, and in minor chords the minor third comes 1st, such as A to C in A minor. if you are feeling daring you can add another third above the triad to create a seventh chord. e.g. C,E,G,B (G to B is a third) this is a C major 7 chord.
A minor third is an interval of 3 semitones, e.g. C to E-flat or A to C, in A minor the key is A,B,C,D,E,F,G (but usually the F is played as an F-sharp as it is often played as the harmonic minor but it is never written in the score) so an A minor triad would be A,C,E as they are all thirds apart, to check it is an A minor chord see how many semitones there are in between an A and a C, there are 3, not 4 so it is a minor third so the chord is minor. the second chord in the clip is an A minor (you can also tell it is minor as it sounds sad.)
Now for a lesson on thirds, a major third has 2 tones in between the two notes, so in between C and E there is C to C-sharp, C-sharp to D, D to D-sharp and D-sharp to E so that is 4 semi tones or 2 tones (a semi tone is a gap between two directly adjacent notes e.g. C and C-sharp, a tone is just 2 semitones) this means it is a major third so the triad C,E,G is a major chord, (E to G is a minor third as it only has 3 semitones in between E and G)
The most common chord is called a triad, it has 3 notes and the have intervals of thirds (in others words they have one note in between them (from the scale of the key), e.g. in C major the notes of the scale are C,D,E,F,G,A,B so a third would be C to E or D to F) in this clip, the chord C major is played first, the first note is C, the next note is E as it is a third away (one note in between), then a G is the next as it is a third away from E this gives you C,E,G and this is how you make triads