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Happy Birthday Chords: Cadence Examples
The chords of any well-structured popular song, such as "Happy Birthday," provide examples of cadences performing their functions, as shown in the graphic below. You can easily hear the following cadences:
I — V (half cadence or imperfect cadence)V — I ((full cadence)I — IV (plagal half cadence)

FIGURE 53: “Happy Birthday” Chords and Cadences