Natural Flat Sign A natural flat sign contradicts (naturalises) a double flat sign (bb).
Natural Sharp Sign This contradicts (naturalizes) a double sharp sign (x).
Natural Sign This contradicts (naturalizes) a sharp (#) or flat (b) -- the note marked becomes a 'natural' note. If affects all notes in the same position which follow in the bar .
Accidental any sharp, flat, or natural that is not given in the key signature. An accidental in front of a note applies as often as the note is repeated at that particular octave during the remainder of the bar it is in. In the bar that comes after accidental sharps or flats is usual to find 'warning' to contradict the accidentals in the previous bar.
Aeolian Mode A medieval mode whose scale pattern is that of playing A to A on the white keys of a piano. This scale is also called the natural minor scale.
Key Signatures A grouping of sharp or flat signs placed immediately after the clef on the lines of the staff. Unless contradicted (cancelled) by natural signs, they affect every note with the same name as the ones marked.
