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As head of self are called all the sounds in the scale of a home key are included. They form the starting material for the melody and harmony of a piece. Tones to which this condition does not apply are called external to the ladder .

If the tonal center changes due to modulation or evasion , the basic scale and the assignment to the ladder / alien will also change.

With most modulations a tone foreign to the ladder initially occurs, which then turns out to be the ladder's own tone of the target key.

  • Modulations without chromatic changes (i.e. only with ladder-specific tones) are called diatonic modulation .
  • If tones other than the conductor are used, the process is called extended diatonic modulation .
  • If chromatics are used or enharmonic confusion is applied, one speaks of chromatic or enharmonic modulation .