Should Public School Choirs Sing Christmas Music at Christmas?

I have written before about various public school "holiday" concerts where the music directors were forced to not include any Christmas music. The justification is generally a misconception of the so-called "separation of church and state."  The below has a good discussion of this issue. It is written from the perspectives of school personnel who actually have to deal with the issue.

http://www.reporternews.com/news/2010/dec/13/religious-music-public-schools-hed-help-hed-help/