[Yshania]

If you delete something from your library in iTunes, you will lose it from your playlist, too. The library is where it stores the master data. What I would suggest is don't play anything from your library at all, just copy what you DO want to listen to to a playlist, and use that (after all it is only a link to the song you are copying to the playlist and not another copy of the song).

Copy your German stuff to one playlist, and all your music to another, then use your playlists instead of your library. I have multiple playlists, depending on mood and occasion. When you set a playlist going, it operates exactly the same way - ie you can set random selection, repeats etc etc.

If you want the German on your Nano, but not on your PC (or vice versa), you can delete it from your pc library, but just make sure you set iTunes not to automatically synchronise with your iPod on connection - otherwise any alterations to your pc will be transferred to your iPod - including any deletions.

If you delete (clear) something from a playlist, it remains in the library. If you delete (clear) something from the main library, you should be prompted. Do you want to send to recycle bin (delete permanently) or do you want to keep file in iTunes music folder. If you choose to keep it in the iTunes music folder, you still have a copy, but it won't be accessible to the playlists (though using Windows Explorer, you can locate the file and open it again, at which point it will be added back to your iTunes library).

HTH