If you see an alert message that says "iTunes cannot play this song" when you try to play Shared Music, it usually means that the computer you are trying to use for playback isn't authorized to play the content.
To fix the issue:
- Exit Front Row.
- Open iTunes and try to play the same song.
- iTunes will ask you to enter the Apple ID and password used to purchase the music. Enter the appropriate Apple ID and password to authorize the computer.
- Verify that the song will play in iTunes.
- Go back to Front Row and play the content.
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