Editing music/voices/icons for a new faction

Does anyone know how I can change the voices and music for a faction? I've changed the culture for the Normans to middle_eastern and thats worked fine, I now get me cities, me pics on event notices etc. But the music is still northern european, and my generals all speak with English accents. Does anyone know the file where I change this?

Also, I've editied the faction icon that appears in the campaign map, but I can't find the one that is used for selecting factoins in the custom battle and grand campaign screens. Bear in mind I'm not just editing an old one but need to add a new one in addition to the rest.

Thanks for any help.