Composition
Lyrically, the song talks about someone who has got over a broken relationship, declaring the partner as "so yesterday". According to Duff, the song's lyrics are very empowering towards breaking up with someone and getting over it. In a 2006 interview with Instinct, Duff said that people often told her that "So Yesterday" was "the ultimate post-breakup anthem". She said her mother instilled the notion of inner strength in her, and that she wanted the music she makes to be positive. "I don't think there's very much of that out there anymore.", she said. She stressed the importance of strong songs that are not all about how "a boy broke your heart and you're never going to get on your feet again", saying it was good for girls to hear.
Musically, "So Yesterday" is moderately paced, with influences of pop and rock music and moves at a tempo of 76 bpm. The song is set in the signature of common time, and is written in the key of C♭ major. The song has the sequence of Am–G–Fmaj7 as its chord progression. Duff's vocal range in the song spans from the note of G♯3 to the note of B♯4.
Read more about this topic: So Yesterday
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