"Santa Claus is Coming to Town" is an orphan, a Christmas song without a singer attached. "White Christmas" has Bing Crosby, "It's the Most Wonderful Time of the Year" has Andy Williams, and "Happy Holidays" has Peggy Lee. But who sang the early version of the Christmas classic that casts a shadow over all the versions that follow? Nobody.  This week and next week, I'll tell the story of the song, from its writing to its place in the Christmas canon today. I'll tell the story of the song growing up, starting this week with its early days.