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Looking at the adult contemporary format stations it seems to be 50/50 as to whether it is capitalised or not, and the article you direct me to isn't capitalised. I also see no convention on the relevant wikiproject to say one way or the other. Even looking through a random category (Radio stations in Boston) it seems just random which is used, maybe slanting every so fractionally to lower case but not enough sample size to dictate one way or another for definite.  talk "