Why Can You Play the Same Notes Over Cm7 and EbMaj7? One Shape, Two Chords
Drop the root from Cm7 and an EbMaj7 triad is left — which is why the vocabulary you built two bars earlier still works. Upper structures, the chromatic slide into Bbm, and the common tone line turn one shape into a whole chorus.
sition? Playing Your Own Changes Over the Band’sWhat Is Superimpo
Superimposition means playing your own chord changes on top of the band's — and it's earned through voice leading, not license. How half-step upper-structure moves create the altered sound and outside colors that still resolve.