The help files for Google Play Music say I can copy music files via USB to the tablet and play them. But if I copy an mp3 file to /sdcard/Music, I can't seem to convince the google play app it is there. I can tell a file browser to play the file, and it will start google music to play it (foregound only), but I can't start google music and get it to play the file. The Movies app has a "Personal Videos" tab for playing videos you can stash in /sdcard/Movies, but I can't find anything like that for music. Anyone know if this is possible?