Q: Imaj6/9 VIIb6add4 IV VImaj9  I'm struggling to think of a fun extension for the IV chord in this progression. What would you suggest?  VIIb6/9 - Imin(add9) - VIbmaj9  This is the progression for the next section. Why does the Imin work as well as the Imaj?
A: you are not giving me enough details for me to understand the context of this. to be fair, in my opinion the only way to really know how music goes is to hear it. all those chords could be voiced in a million different ways, and more important still is the timing. also, what the heck is VIIb6? don't you mean bVII6? also, i use chords as a way to support the song. i am usually not interested in evaluating chords outside of the context of the song. and if so, i would definitely need more specifics as to exactly how each one is voiced, in which octave, and more importantly the timing, tempo, etc. none of which can be determined by looking at a list of chords