General Google Music: "You don't have any music in your library."

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http://androidforums.com – Hi, My wife recently got a Thrive. So far so good. I copied a bunch of music from her computer to the device, using ES File Transfer app. For a short time, when I opened the Music app (that came on the device) it would show all the music I put there. Now suddenly it says there is no music in the library. The files are still there because I can see them on the file explorer. I can tap on them there, and they play. but I don't get all the features of the Music player. if it matters, the files are on the internal memory (we haven't put in an SD card yet). but it shouldn't matter (General)