Yesterday, I had one of those musical days that a church musician can experience during the festival seasons of Advent and Easter, if that musician is very lucky:  I spent the whole day singing something wonderful.  In the morning, the Vivaldi Magnificat at Calvary Baptist Church, and in the evening, Handel's Messiah at Millian Methodist.  And this morning, despite the twitchy muscles in my calves and the desperate need to spend some time in the hot tub at the gym (thanks to a very long time standing in heels), my thoughts are all about the dualities of life and the building of community. Okay, let me pause a minute.  If…