C♭, or C flat, is a musical note that is one semitone lower than the note C. In the context of the musical scale, it is often used in various keys and can be represented on sheet music with a flat symbol (♭) placed before the note. C♭ is enharmonically equivalent to the note B, meaning they sound the same but are notated differently. In Western music, C♭ can appear in different contexts, such as in the key of C♭ major, which consists of seven flats. This key is less common than others, but it is important for certain compositions and can be found in works by composers like Johann Sebastian Bach and Ludwig van Beethoven.