Idiom and part writing rules

cad64

5th in bass, inverted I 6th and 4th both move down to 3 and 5

what always goes down?

7th of chord, not scale degree

what sometimes goes up?

7th of scale. Optional if in inner voice

if you move up and down from a chord in a minor key

parallel 2nds sometimes

with 345 use

parallel motion

ii6

should lead to cad64 or V

viio ii6 cad64

yes! double bass!

V7 V65 lead to

I

ii6 does not go back to

I

viio leads to

I

V43 leads to

I or I6

3,4,5 in soprano

I, V43, I6

1,2,3 in bass

I, V43, I6/I6, vii6, I

V42 leads to

I6

1,2,3 in soprano

I6, vii6, I

V never goes to

IV or ii

I6 IV6 V6

do not double bass

with 123 use

contrary motion

when to use viio and when to use a V43 chord

contrary motion = viio6 parallel motion = V43

cadential ending

ii6, cad64, V7, I

ii6 in minor keys

mandatory?