In music theory, a natural is an accidental which cancels previous accidentals and represents the unaltered pitch of a note. A note is natural when it is neither flat nor sharp (nor double-flat or double-sharp either). Natural notes are the notes A, B, C, D, E, F, and G, and are represented by the white notes on the keyboard of a piano or organ. On a modern concert harp, the middle position of the seven pedals which alter the tuning of the strings gives the natural pitch for each string.