View source for Non-Diatonic Chords

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Strict diatonic note and chord selection provides a gigantic amount of possibility for song-writing and solo'ing; however, it still places us inside a box that we occasionally want to escape.  '''Non-diatonic chords''' allow us to do so.  For any key, the possibilities for non-diatonic chords are huge.  We limit ourselves to a few popular examples listed below.  These fall under one of a few categories.

* '''Tonicizations''' use diatonic chords from other keys to temporarily alter the tonic center of the harmony.
* '''Borrowed chords''' use diatonic chords from other keys with the same tonic note.
* '''Chromatic chords''' cover all remaining cases.  They maintain the tonic note but are non-diatonic to all the standard parallel keys/modes.  They borrow from the chromatic scale, which allows any possible chord to be formed.