download and install like any other regular apk
sorry guys....using a file manager
1. delete GoogleMusic.apk under system/app. ( make sure you press mount r/w it becomes mount r/o first )
3. move your downloaded file to the same place in the first step and install
remember always do a nandroid backup...
to install : push to /data/app/ and reboot. also i removed old music app data from /data/data