Diatonic Harmony
In any particular key, if we use notes belonging to that key to build chords, then we call in diatonic harmony. If we use notes that don't belong to the key, we call it chromatic harmony.
eg. In C Major, the chord Eminor7 (E, G, B and D) would be diatonic as it only uses notes from C Major, whereas E7 (E, G#, B and D) would be chromatic as it includes a note from outside the key of C.
Primary and Secondary Chords in Major Keys
The Primary Chords are chords I, IV and V and are major(ie. those built on the 1st, 4th and 5th scale degree in a particular key).
The Secondary Chords are chords ii, iii and vi and are minor
You will need to know at least 1 to 7 in roman numerals:
I, II, III, IV, V, VI, VII (upper case)
i, ii, iii, iv, v, vi, vii (lower case)
A triad is a three-note chord in a closed position with the root at the bottom.
Remember: a triad goes line, line, line or space, space, space.
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