There is a wealth of Christmas repertoire for choirs to choose from and sometimes it is difficult to select which arrangement you want of your traditional carols. It is refreshing when you get a selection which has a new version of a familiar carol plus two carols which you think you should know but donâ??t. This is the case with Joanna Gillâ??s three new carols. â??Sir Christèmasâ?� a tradition…