I concur. I'd say when trying to harmonize vocally, work it out on an instrument first. Most do it with the melody, so why not?
And yes, adding those "color" tones and using different voicings works wonders. As I said, try this out on a piano. (Of course, this depends on the kind of sound you want)
On the part-writing thing (which is what some are alluding to) it's all about motion. When it's said that perfect unisons, fifths an octave aren't recommended (though that's not really "fair" with a m/f duet. lol), what this means is that two parts (most importantly the bass and soprano) can sing a fifth (C-G), but can't sing (D-A, E-B, etc. in the next incriment.) because they're still a fifth apart.
Granted, this seems odd when building 7ths on up to 13ths from scales because, the first & third notes are a fifth apart as are the second & fourth. The exception would be the 11th because you need to alter them (raise usually to get the P5 interval (between the 7th and 11th (the altered 11th is colored purple)
CMaj7 or CMaj9 (one more note added, but the third & fifth notes are a fifth apart)
Find all the Perfect 5th intervals
CMaj7 (
9) -
C-
E-
G-
B-D-(F#)-A Dm7 -
D-
F-
A-
C-E Em7 -
E-
G-
B-
D-F# FMaj7 -
F-
A-
C-
E-G G7 -
G-
B-
D-
F-A Am7 -
A-
C-
E-
G-B Bm7b5 -
B-
D-
F-
A-C (not Ab)
Now, chords can be sung like that, but when written (if checked), it's a no-no. However, all the other intervals are acceptable - and use those that create dissonance to add more flavor, color - or -
tension,
The Major 7th, minor 2nd and tri-tone are the most tense intervals - even if something else is added, but they're less tense when something is added because it's make more sense to you and your ear.
F#-C or C-F#. What is that?
Well, that's either the obvious D7, but also:
Ab/G#7; F#/Gb7b5; F#/Gbdim7 (dim7s can be flipped; thankfully, there's only three of these as they repeat themselves.) C(b5), C7b5, Cm7b5 and so on. The thing is for a tri-tone to exist the interval is either an augmented fourth (C-F# as in D7) or a diminished fifth (C-Gb as in C7b5)
A major seventh in any position other than root - although still tense in that position because the top note wants to walk up to said root (8va). (Raise the fifth and it'll really want to do that. Actually,
two notes want to walk accordingly -
especially, if it's a cadence. G7
b9 (color tone)-C,
Db7-C (
tri-tone substitution) or CMaj7
#5 (equivalent color tone; #5 = b9)-C.
G-B-D-F-Ab; although a better resolution happens when it's written/played like this:
(Notes that want to resolve are red; where they resolve is blue.)
G-
D-
F-Ab-Cb -----> C-
E-G-C (V
7b9-I)
D-
F-Ab-Cb ----->
C-
E-G-C (iidim7-I)
Likewise,
Db-F-Ab-Cb ----->
C-E-G-C (bII (VI/iii)-I)
C-E-
G#-B -----> C-E-
G-C (I-I: where the first I has an altered tone in it)
This is pretty basic, but necessary to know (=/= to spit out) when working with harmony.
Most already know it's my favorite part of music. How she moves is a big part of it and if you let her she'll move on her own.