I received a new nano and tried Rhythmbox right away. It crashed immediately. So, to find out the source of the crash, I went to command line and typed sudo rhythmbox and it loaded up and crashed again, but this time it told me why. The reason it crashed was because it didn't have this file:
/media/ipod/iPod_Control/iTunes/iTunesDB
So, I recreated it by going to command line and typing:
sudo apt-get install gtkpod
sudo touch /media/ipod/iPod_Control/iTunes/iTunesDB
sudo gtkpod
Then, I chose Create iPod's Directories, then added a
sample MP3 file and clicked the button to resync.
When I closed gtkpod down and brought it back up, the file I added to the iPod was still there and not just in the local directory. I then used 'ls' at a command prompt and checked the iTunesDB and found that it had been updated with new data and now had other files in the same directory.
After that, I could use Rhythmbox with no problem. Hopefully this will help you be able to recreate the iTunesDB if yours is corrupt or if you simply don't want to use the iTunes service or Windows and just want to do everything purely the Linux way, putting MP3 and other kinds of files on yourself.