Topmusicanswers
Because
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....
Why some musicians insist on naming notes using odd numbers?
Because it is an 11th chord we know it also has the other notes in it and they don't have to be notated individually unless they differ from the stand...