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In page That Should Be Me:

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According to the sheet music published at Musicnotes.com by Sony/ATV Music Publishing, "That Should Be Me" is set in common time with a moderate tempo of 69 beats per minute. It is composed in the key of C minor and raises up half a step after the bridge[2] with Bieber's vocal range spanning from the low-note of G3 to the high-note of C♯5. The song follows in the chord progression of Cm–A♭2–E♭–G/B.[3] Described as a "sobbing" ballad by Monica Hererra of Billboard, Bieber "pleads the girl he left behind to take him back."[4] Herrera called the ballad "orchestral" and said that Bieber plays the "scorned ex" in the song.[5]