Garland or Nat King Cole's 'Have Yourself...' (am I the only one who finds that tune really melancholy and sad? - not good for depressives)
It's from the movie "Meet me in St. Louis, a great movie btw, and when Judy Garland sings it to Margaret O'Brien it is very melancholy. The line "Have a merry little Christmas now" is referring to next year's Christmas might not be so good.
Seriously, rent "Meet Me in St. Louis" . It is full of great songs. Judy Garland is wonderful in this movie. Vincente Minelli, the director fell in love with her making this movie. She is lit beautifully.
Alright, I'm done now. I feel like Robert Osborne of TCM