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scales and chords and harmonies are all interrelated.
a chord is basically 3 or more notes. a chord consisting of 2 notes is called an interval. an interval is the root note (tonic) + major 3rd note. a chord is the roote note + major 3rd + perfect 5th (+ successive additional notes in harmony for larger chords such as 7ths, 11ths, 13ths etc)
how does this relate to scales?
take a scale from root C (a Cmaj scale):
C, D, E, F, G, A, B, C
C is the root note
D is the 2nd note of the scale aka major 2nd
E is the 3rd note of the scale aka major 3rd
F is the 4th note aka perfect 4th
G is the 5th note aka perfect 5th
A = major 6th
B = major 7th
C = perfect octave
so in a typical Cmaj scale a C chord would be C, E, G
you can ascend and descend up and down a scale using chords that match the tonic of the root note of the scale. additionally you can play in harmony (5ths, 7ths, 9ths, 11ths, 13ths) and it wont sound messed up.
theres a better, fuller explanation here:
http://www.tranceaddict.com/forums/...t=&pagenumber=3
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