Secondary Leading Tone Chords

Pumpthrust

New member
Help!
I forgot all about secondary leading tone chords-how to spell 'em and how to resolve 'em. I know my secondary dominants, but I forgot the rules of tonicizing the vii chord.
 
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all of my reading and knowledge says you do not tonicise chord vii because it is a diminished triad and therefore cannot be the tonic of key (this of course denies the use of the Locrian mode, but that's another story).

If I were to do this I would consider using #IV7 as the dominant 7th chord leading to it

and so we would have in any key

#IV7vii7b5
34
#12
#66
#47

in C major that would be

F#7Bm7b5
EF
C#D
A#A
F#B
 
so after doing some reading (found a book by William Russo that covers this

Composing for the jazz orchestra)

he offers the following as preparation for the LTS

ii7b5
ii7V7
ii bII7
IVbVII9i7b5
iviv7
bVIiv
bvi
bvi7

any chord in the first column goes to any chord in the second column goes to i7b5

of particular use from this chart is a way to continue the progression via ii-LTS~dominant/substitutes~i-LTS

e.g. (using bII7 as the intermediary and recasting each tonicised LTS as ii7b5 for the succeeding cadence)

Dm7b5-Db7-Cm7b5-B7-Bbm7b5-A7-G#m7b5-G7-F#m7b5-F7-Em7b5-Eb7-Dm7b5-etc
 
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