24d : ?A?A?E? Oh dear - just this last one to go and I've completely run out of ideas! I'm pretty sure that the first letter is "F", but this isn't helping any. A hint would be most welcome.
Haha. Of course. Complete failure of technology - regular expression search for .a.a.e. against a monstrously long list that had coded Janacek as Janá?ek. Lesson for me there! Many thanks