In my Ten Commandments for Piano Arrangement, I mentioned a technique I called mapping the harmonic rhythm. As a composer, it’s very valuable to see where the chords are changing and where they are not. Basically, if you find your harmonic rhythm too predictable, or perhaps too unpredictable, the composition will be less effective than it could be.
To start such a map, you need a basic understanding of music, especially of chords and keys. I assume that if you’re still reading, you have passed or could pass Freshman music theory, because you should really get the basics before you go any further in your composition attempts.
I have to insert at this point that this is my own method of harmonic mapping. I don’t know of any other composers who do this process in this specific way, but it works.
You probably want to start this with a piece of sheet music, but you could do it with music you have not yet notated.
You will also want some colored pencils. Any colors will do, but I will suggest a few for ease in talking about this process.
Here we go.
1. Two ground rules. First, we ignore most nonharmonic tones: passing tones, neighbor tones, appogitura, etc. This makes it simpler to see the broad brush strokes of harmony rather than nitpicking each note. Second, we only mark on chord changes. If you have an uninterrupted series of C minor chords that lasts for 18 bars, only mark it once, at the beginning.
2. ONE is black. It’s usually the most common chord. Every time you are on one, write a big I or i under the chord. (In case you don’t know, capitalized roman numerals are major chords, and lowercase roman numerals are minor.) So in the key of C major, every C major chord gets a black I underneath it.
3. FOUR and FIVE are green. These are most common besides ONE. Write their numerals in green.
4. All other major chords are red. All other minor chords are blue. Write their roman numerals.
5. Key changes get circled in orange. Short passages utilizing secondary dominants get circled in yellow.
6. Optionally (extra credit), put large purple parentheses around cadences.
Now look at your harmonic map and answer the following questions:
* Are you visiting I, IV, and V almost exclusively? If so, your composition is almost certainly boring.
* How often do you change chords? Once every measure on the first beat through the entire piece? Consider changing it up. It is possible to use interesting chords and change them at uninteresting times, and the result is not favorable.
* Do you utilize secondary dominants and key changes? Accidentals, when used properly, are our friends. They take us out of a stagnant key area and move us somewhere interesting for a moment.
* If you did the extra credit and put parentheses around your cadences, do you vary the types of cadences you use? For example, do you always end a line with V - I? If so, try to broaden your horizons a bit and expand your vocabulary in harmonic punctuation.
Now, here are a few resources to improve your skills.
For cadences, look at the definitions at http://en.wikipedia.org/wiki/Cadence_(music) and try writing a few.
For secondary dominants, look here: http://en.wikipedia.org/wiki/Secondary_dominant
Additional information on improving harmonic rhythm: http://www.musique.umontreal.ca/personnel/Belkin/bk.H/H4.html
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