Hmph. I'm on a galaxy S3, and Amazon music just skips from one track to the next at hyper speed, never playing anything - Groove just won't start the music. Google's music works fine with mp3s from storage....
I'm confused about gapps with AICP -- I did a full system wipe and then flashed a nightly on Friday, without flashing gapps (I just forgot).
Imagine my surprise when everything seemed to just work?!
I later restored some backed up system settings with TiBu and Google play service went crazy crashing over and over, but when I re-wiped and re-flashed without gapps again (avoiding those system settings) everything is back to "normal"!