The Marvelettes: Please, Mr. Postman
Yet another definitive postal song that I couldn't let pass by. This song was The Marvelettes', one of the first girl groups of Motown, only #1 song, though they had a number of other top 40 hits. The song was well loved enough to be covered by other popular bands, including The Carpenters and The Beatles. The Carpenters even took it back to #1.
In the song, a girl pleads with the postman to look in his bag one more time to check for a letter for her because it's been so long since she's heard from her man.