sedmičkové akordy 
II-V-I dominantní jádro ¨

X /\ = Xmaj = Xj = velká 3, velká 7 (půltón od root), a 5 nebo 6, velká 9
X-7 = Xmin7 = Xm7 = malá 3, malá 7 (celý tón od root), a 5 nebo 6, velká 9
X7 = Xdom7 = velká 3, malá 7 (celý tón od root), a velká 6 nebo velká 9
Xsus7 = X7sus4 = velká 3 zvýšená o púltón, malá 7, velká 6, velká 9

akord se staví od 3 nebo 7 stupně

tritónová subsituce

Chord substitution often results from an attempt to provide smooth voice leading. Using the tritone substitution, the roots of the ii-V-I progression move down by half-steps, instead of ascending 4ths. For example, in the key of C the progression becomes Dm7, Db7, CM rather than Dm7, G7, CM.

http://hum.lss.wisc.edu/jazz/substitutions.html

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