I realize I'm musically illiterate and I need some help with piano & guitar.

Here's the thing, my wife and I and a friend are writing some Gospel songs. Our friend Roger plays the guitar and mostly we arrange so we can transpose up on the keyboard and he can kapo the guitar, so far so good.
If we want to play in a key(Ab) that he does not know or can play the chords that's where my question comes in.

Where could he play to accompany the piano. Would 1/3 up work?
How is the best way to approach this.
Thanks
Wyndham

Last edited by Wyndham; 06/30/14 09:37 AM.