OK make sure the files has as much info as possible. Whilst iTunes is a good encoder of id3tags, it's not the best of readers of id3tags (to say the least (which is why I also use mp3 rage to help encode id3tag info before or even after adding to itunes.) Don't make the id3tag the newest version otherwise some mp3 players won't recognise the tags. The newer the tag version the more info that can be added such as no. of characters, etc.