"Have Yourself a Merry Little Christmas" was first introduced in the musical film "Meet Me in St. Louis" in 1944. The song was sung by Judy Garland and has since become a Christmas classic, with numerous covers recorded by various artists over the years. The song's original lyrics were considered too depressing, and Garland asked for them to be changed to something more hopeful. The revised lyrics are the ones that are now commonly sung.