Because

Jazz Theory in progression IM7-VIm7-IIm7-V7, why can the VIm7 be subsituted by VImMaj7?

Jazz Theory in progression IM7-VIm7-IIm7-V7, why can the VIm7 be subsituted by VImMaj7?

It's because the note that changes vim7 to vimMaj7 serves as a leading tone to the tonic of ii; a kind of altered V/ii.

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