5. Mary's Lullaby: John Rutter
Into the top five, and another John Rutter classic, notable for having been written in the space of a single evening in order to fill a three and a half minute gap at the end of a BBC documentary about a choir he was involved with at the time. I think the basses are way too loud in this recording - it is a lullaby after all - but it was the best one I could find.
This carol, which ends with the words "Lullaby my little baby," did not mean a lot to me until I had children of my own, so this choice is dedicated to my babies - George and Clara.