Below are the rules which relate to the addition of ii-V sequences to existing chord charts. By adding ii-Vs, chord sequences can be made more interesting - the original chord sequence can even stay the same. The ii-Vs need not replace anything - they can just be input as additions.
1) A ii-V sequence can be added anywhere if the target chord is a major chord. Eg, if the target chord is a Gmaj, Am-D7 can be added before the Gmaj.
2) If there are multiple 4-5 sequences in a single line/passage, introduce a ii-V in the key of the 5. Eg. in the key of D - if there's a G-A sequence, add an Em after the G leading into the A, leading to a G-Em-A sequence.
3) Alternatively, replace the G with an Em, changing G-A into Em-A.
4) If there's a 1-4 (eg. F-Bb in the key of F), add a minor ii-v in the key of the 4. Eg. F-Bb will become F-Adim7-D7b9 - Bb. NOTE: DO NOT USE THIS MORE THAN ONCE IN A SINGLE VERSE/CHORUS OR IF THE MELODY FALLS WITHIN A SEMI-TONE ON EITHER SIDE OF THE GUIDE TONES OF THE ADDED CHORDS
5) Any dominant7 chord can have the minor seventh chord a fourth below placed before it. Eg. A7 can have Em7 before it, or a Dm7 can be placed before a G7, etc.
6) Any minor 7 chord can have the dominant seventh chord a fourth above it placed after it, for example B7 can be placed after any F#m7 chord, etc...
7) A ii-V can be added in the key above a target ii-V sequence. Eg, if the target chord is Cmaj and the ii-V preceding it is Dm-G7, Em-A7 can be played prior to the Dm-G7 ii-V.
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