Blasted Google Play Music!
No, it works GREAT. But I don't have a single song pinned for offline listening... yet it eats up a tremendous amount of space. I just started a nandroid and the file size is almost 3GB thanks to Play! Now I have to go back in, delete the nandroid, wipe app cache and data, then make the nandroid again: it'll be around 1.3GB.
WTH is it storing on my phone????
: On a separate note... WOW! Gamers rejoice!