Did a cork pop?  Did the world stop?  Am I just in love…with the music and lyrics of Hugh Martin?  Even if you don’t know the name of the late Mr. Martin, you certainly know his songs: “Meet Me in St. Louis,” “The Trolley Song,” and a little song heard every season, year after year, by the name of “Have Yourself a Merry Little Christmas.”  But these songs from the MGM musical Meet Me in St. Louis are just the tip of the iceberg of Hugh Martin’s catalogue, a few highlights of…