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Oh yeah, that Google Music "mockup" (http://bit.ly/Xbs28D) was actually a screenshot. =P

Edit: APK here (https://www.dropbox.com/s/ggnpxfano8zj0sy/White-Music4.4based.apk). Work in progress, see comments.

Edit: Awesome new version is here. http://forum.xda-developers.com/showthread.php?t=2140756