Post by PtThe simple form of a chord is a triad or 3 notes consisting of the
1st, 3rd and 5th notes of the scale.
(there is a diad which is two notes played together but I do not
consider this as a chord).
A triad is 1, 3, 5 notes of the scale.
A 7th chord is 1, 3, 5, 7 notes of the scale.
A 9th chord is 1, 3, 5, 7, 9 notes of the scale.
An 11th chord is 1, 3, 5, 7, 9, 11 notes of the scale.
A 13th chord is 1, 3, 5, 7, 9, 11, 13 notes of the scale.
Looking at this you will see that it is difficult to play all the
notes in an 11th chord and impossible to play all the notes of a 13th
chord on a guitar.
The most you notes you can play at once are 6 because the guitar has 6
strings.
A 13th chord has 7 notes in it.
The problem is that most music theory is written for a piano.
You can play up to 10 notes at once on a piano.
This is where a guitar becomes a unique instrument.
When playing 5 note or more chords you will often not play every note
in the chord.
And often when you hold down 6 strings on a guitar you are actually
playing some of the same notes twice but an octave apart.
How do you know what and how many notes to play for a chord?
This should be an interesting thread.
Pt
typically, some quick rules of thumb, to reduce voicings to their absolute
essentials, you can:
- drop the 5th (if it isn't altered i.e. #5 or b5, hence too important to
the chord)
- drop the root
- for ninth chords you can add9 (triad add9 with no 7th), drop 5th or root,
or do sus2 (drops almost everthing ;') e.g. R, 2, 5 or R, 5, 9).
- to add the 11th (same as 4th) you might drop the 3rd and add 4 (is sus 4),
also drop 5th or root
- for 13th chords you can use 7/6 (no 9th or 11th), or drop 5th, or drop
root . . . ya-da ya-da
in general, drop 5th or/and root if needed, and any altered 5th (b5/#5) or
altered extension, like b9/#9, #11, b13 would be kept.
once you get a complete list or grasp of possible reductions you can also
study voicings for ukulele or mandolin (both having only 4 functional
strings hence notes possible) and see how they do what they do. How do you
play a 13th chord on a ukulele, what tones get dropped? Baritone Ukulele is
tuned the same way as the highest 4 strings of a guitar.
that isn't exhaustive, but it's a start. [Mike C. has probably covered this
in detail a past thread and will probably repost it or fill in any blanks.]
Extended chords in general (6, 7, 9, 11, 13) can be reduced as low as the
base triad or base 7th chord and the chords will still work, as a sketch
outline, in other words _if_ you conceptualized these as "extended" chords
just remove the exentions back closer to where you started.
You can also think of seventh chords as upper and lower triads and play the
upper triad only (let's say). This is how the Dom7 chord (true V7 of the
key, like G7 of key C Major) actually works. It's actually incorporating the
diminished triad built on the 7th degree (leading tone) of Major as it's
"upper triad" or highest 3 tones. Much of the "tension", desire to resolve,
resides there, that "leading tone" root movement of the chords B-C, vii°-I
is (part of) the essence of V7-I, that's the secret (or one of them). So
instead of GBDF use only BDF (the upper dim triad).
Another part of the secret of the true dominant 7th chord is that there's
also the interval of a tri-tone contained with in it, between it's 3rd and
7th, B-F. In and of itself the tri-tone interval, 6 semitones wide, is
dissonant or "unstable", tense (creates tension that wants resolution or
restfullness, concord, stability). But this is not just any tritone. You
have to think of it in context of the particular key, say C Major, and the
true Dominant 7th chord of the key of C, is G7.
First, consider what makes "Major" Major. First and formost it's the 3rd
interval, the Major 3rd. The Major 3rd of C is E. So in the key of C Major,
C and E are where we want to resolve to ultimately, the end of the
progression and defining the sence of the key or tonality, a particular
tonic and a particular flavor, _Major_ flavor. Now go back to the B-F
tritone of the G7 chord. It just so happens that those two notes can resolve
beutifully to tones C and E (the ones that will best define our key C Major,
it's tonic triad). If you remember, the C Major scale has two spots, two
sets of neighboring scale tones that only have 1 semitone distance between
them: EF and BC. Those minor 2nd intervals, if played as a small chord or
even as melody (one frets distance) are very tense, dissonant. You know that
if you play a "wrong" note you can usually "fix it" by using the tone one
semitone away, higher or lower. So just like the tritone, minor 2nds are
also dissonant and want resolving. So there are many tensions and their
resolutions that will be at play that get resolved when you go V7-I in a
Major key. At any rate, here's how the tritone interval B-F in the G7 (V7
chord) gets resolved in the key of C Major:
B-> C E <-F
this is called "step-wise contrary motion", one note is resolving _up_ a
semitone (B up to C), the other is resolving _down_ a semitone (F down to
E). And in both cases the tones are moving to a nearest "scale-step" natural
to the scale (which happen to be only semitone steps away in this case).
C E, of course are part of the C Major triad CEG (it's root and 3rd), the I
chord (home) of the key.
you can play this resolution, and _see_ and hear the contrary motion, like
this:
xx_9x6x B F
xx10x5x C E
note that all of these same key tensions/resolutions also occure, are
present, just by using the leading tone triad of C Major, B diminished, B
vii°, rather than the full G V7, Dominant 7th of C Major.
Sorry, I got carried away, but that's a really fundamental bit, the V7-I
resolution and the basic observed pattern that then gets reused in
"unnatural" situations, by altering chord tones to achieve the same effect
somewhere else, almost anywhere else you might want. This is how/why you get
cycles in 5ths, progressions of V7's, V of V of V etc, creating secondary
dominants and Dom7ths, V7 of V7 of I, etc -- even though most of the V7s
(secondary V7s) do not occure "naturally" to the harmonized scale (chords
built of thirds naturally occuring with the scale and upon each degree of
the scale).
Understand though that all this stuff is man made theory, and comparatively
recent theory too (a couple few hundred years at best), a set of subjective
preferences and common ways of explaining or justifying it.
Also remember that a singer or any other instrument present can carry one of
more notes of any chord (or melody line notes), even the most key definer
tones of the given chord. So there's many factors to concider when reducing
chords to what _you_ need to be playing.
You could apply the above principle (upper and lower chords) further too (to
achieve a reduced tone-set), e.g. a ninth chord could be seen as upper and
lower seventh chords (if you had to or wanted to). Drop the root of a Dom9
and you have a half-dim 7 chord (R, b3, b5, b7 if reconed from the new
lowest pitched tone up) rooted a M3rd higher than the original dom9 chord.
It's just another way of thinking about or approaching reduction to
essentials, suggesting or implying an expected or intended pattern.
Roger