Editing Musical keyboard (section)

==Description==
[[File:Clavecin flamand.png|thumb|Harpsichord with black keys for the [[C major]] [[Musical scale|scale]]]]
The twelve notes of the Western [[musical scale]] are laid out with the lowest note on the left. The longer keys (for the seven "natural" notes of the [[C major]] [[Musical scale|scale]]: C, D, E, F, G, A, B) [[wikt:jut|jut]] forward. Because these keys were traditionally covered in [[ivory]] they are often called the ''white notes'' or ''white keys''. The keys for the remaining five notes—which are not part of the C major scale&mdash;(i.e., C{{Music|#}}/D{{Music|b}}, D{{Music|#}}/E{{Music|b}}, F{{Music|#}}/G{{Music|b}}, G{{Music|#}}/A{{Music|b}}, A{{Music|#}}/B{{Music|b}}) (see [[Sharp (music)|Sharp]] and [[Flat (music)|Flat]]) are raised and shorter. Because these keys receive less wear, they are often made of black colored wood and called the ''black notes'' or ''black keys''.  Black keys form a [[pentatonic scale]]. The entire pattern repeats at the interval of an [[octave]].

The arrangement of longer keys for C major with intervening, shorter keys for the intermediate semitones date to the 15th century. Many keyboard instruments dating from before the nineteenth century, such as harpsichords and pipe organs, have a keyboard with the colours of the keys reversed: the ''white notes'' are made of ebony and the ''black notes'' are covered with softer white bone. A few electric and electronic instruments from the 1960s and subsequent decades have also done this; Vox's electronic organs of the 1960s, Farfisa's FAST portable organs, Hohner's [[Clavinet]] L, one version of the [[Korg Poly-800]] synthesizer and Roland's digital harpsichords.

Some 1960s electronic organs used reverse colors or gray sharps or naturals to indicate the lower part (or parts) of a single keyboard divided into two parts, each controlling a different [[Registration (organ)|registration]] or sound. Such keyboards accommodate melody and contrasting accompaniment without the expense of a second [[Manual (music)|manual]], and were a regular feature in Spanish and some English organs of the renaissance and baroque eras. The break was between [[middle C]] and [[C♯ (musical note)|C-sharp]], or outside of Iberia between B and C. Broken keyboards reappeared in 1842 with the [[Pump organ|harmonium]], the split occurring at [[Scientific pitch notation|E4]]/F4.

The reverse-colored keys on [[Hammond organ]]s such as the B3, C3 and A100 are latch-style [[radio button]]s for selecting pre-set sounds.