Flat (♭)

• A flat is an accidental that indicates a slight decrease in pitch (i.e. moving backward of a semi tone).
• A flat is a symbol (♭, also ‘b’ in type, bemolle) placed in front of a note, decreasing its pitch by a half step; Db (or D♭) is a half step lower in pitch than D.
• To “flatten” a note means to lower its pitch by a half step.
• C, C# / D♭, D, D# / E♭, E, F, F# / G♭, G, G# / A♭, A, A# / B♭, B