Originally Posted By: MarioD
I haven't worked with polychords but if I get a chance later today I will try. I do know that you need to get chords that compliment each other, much like your Em and B major. Otherwise all you will get is a cluster and many times a bad sounding cluster!

Indeed. Another thing I tried to get my originally sought octava was using a guitar for the low chord and a ukulele for the high chord. Kinda works.