Music Theory · Tones, Semitones & Accidentals

What does a double flat do, and how far does it lower the note?

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More in Tones, Semitones & Accidentals

What is a semitone (half step) on the keyboard?
How long does an accidental (not in the key signature) stay in effect?
True or false: the smallest distance between two notes on a keyboard is one whole tone.
Why is the distance from C to D a whole tone and not a semitone?
Which two pairs of white keys are only a semitone apart even though there is no black key between them?
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