A couple weeks ago, when it was Elvis' birthday (8 January), I listened to a few compilation albums of his songs, and I noticed something about "You're a Heartbreaker."
Nearly every time "heartbreaker" or "heart" shows up in the lyrics, it's sung with a melisma. In the opening line of the first verse (which is also the third verse), "You're a heartbreaker," the "heart" part of "heartbreaker" is sung to the phrase A F# A. At the end of that verse, the "heart" in the line "But you can't break my heart anymore" is sung to B G.
In the half-verses after the bridges, the "heart" in "heartbreaker" in the line "You're a heartbreaker" is sung to the phrase F# A F# A.
When normally spoken, "heart" has only one syllable, so singing it to more than one musically represents how it's broken.
