I have attended many, many, many, vocal and instrumental presentations in the very fine Lakota Public schools in West Chester, Ohio and I have heard many, many, many medleys of lovely patriotic music. (Well played and sung too, even if they were my grandchildren!

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I don't think we need worry about that. Our teachers teach the traditional music in most places I would think. There is no separation of state and state. AND they also have had medleys of classic religious music.
If you want to enjoy beautiful music, including patriotic music,try to get tickets to most high school productions. It will make you feel all warm and fuzzy.