Question: I have Rhythmbox 2.97 on 32bit Ubuntu 12.10. 

I have a large number of duplicate music entries that don't show up in my music folder. 

I really would like to know if there's any plugin or any means to get rid of them.

Answer: 
It's happened to me a few times...

The easy way to solve this issue is:

1. Open "Home"
2. Press `Ctrl`+`h` (this will show your hidden files and folders)
3. Navigate to `.local/share/rhythmbox`
4. Delete rhythmdb.xml
5. Restart Rhythmbox

The ***rhythmdb.xml*** file contains the music library info for Rhythmbox, by deleting it, you'll be forcing rhythmbox to re-check the library, thus getting rid of the repeated entries.
Some blogger wrote a GUI tool which automatically removes the duplicate entries from the rhythmbox database (without touching the actual files):

```
sudo apt-get install python-tk
wget -P /tmp blog.tappir.com/rhythmboxRemoveDuplicates.py
chmod +x /tmp/rhythmboxRemoveDuplicates.py
python /tmp/rhythmboxRemoveDuplicates.py

```

Reference: <http://blog.tappir.com/?p=13>