Britannica Sources used in this answer

Which notes are in the C major scale?

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The C major scale consists of the following seven notes: C–D–E–F–G–A–B–C.1

In Western music, the major scale is a heptatonic (seven-note) scale that follows a specific sequence of whole steps (W) and half steps (H): W–W–H–W–W–W–H. The C major scale is unique because it contains no altered intervals or accidentals, serving as the foundational key for understanding these relationships in music theory.21