Kristen:
Don't equate editing ID3 tags with messing up the library - you can always redo the tags after you've downloaded the songs.
If you want change a bunch of songs at once, there is a great batch of scripts that will do all sorts of things with tags:
This Tag - That Tag. You can get really creative with these scripts.
If I were you, I would do this:
*Use the "Put This In That" to put the Song Name into an empty field, say "Composer" and DO NOT have the script erase the field when done.
*Then, use the "Put This Before That" to add the Artist Name before the Song Name and DO NOT have the script erase the field when done.
Transfer the songs to your cell phone.
To restore the ID3 tags back:
*Select all of the tracks whose tags you modified (do this by album), and get info. Tick the check box next to song name to remove all of the just edited data.
*Now, run the script "Put This in That" to copy the data from the composer field (or which ever one you selected in step one), to restore the song name data, and let the script erase the composer field.
Hope this helps.
Lita