valid characters

I've had several projects in the past that were Spanish language music.  With most music sung/written in Spanish, they had titles that were also in Spanish.  Spanish, along with several other languages, is different from English due to a few extra letters in the alphabet (letters with accents and the like).  Several words had accents that without the accents meant other things.  I knew I could encode several of the accents that showed up some places but not others.  Almost every player that regularly showed CD-Text would give up and show a blank square when they cam