[link to original on tumblr]
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I happened to hear the Carpenters' version of "Please Mr. Postman" to-day and noticed that there's a melisma on "so" in the line "I've been standin' here waitin', mister postman, so patiently," apparently to indicate the length of time the speaker/singer has waited. I just checkt the Beatles' version ("Please Mister Postman") on With the Beatles, and it has the same feature. (It's probably also in the Marvelettes' original, but I don't have that in my collection.)