Editing Altered scale (section)

==Enharmonic spellings and alternate names==

The C altered scale is also [[enharmonic]]ally equivalent to the C [[Locrian mode]] with F changed to F{{music|flat}}. For this reason, the altered scale is sometimes called the Locrian {{music|flat}} 4 scale.{{sfn|Service|1993|loc=28}}

It is also enharmonically the seventh [[Mode (music)|mode]] of the [[minor scale|ascending melodic minor scale]]. The altered scale is also known as the Pomeroy scale after [[Herb Pomeroy]],{{sfn|Bahha and Rawlins|2005|loc=33}}{{sfn|Miller|1996|loc=35}} the Ravel scale after [[Maurice Ravel]], and the diminished whole tone scale due to its resemblance to the lower part of the [[Octatonic scale|diminished scale]] and the upper part of the [[whole tone scale]].{{sfn|Haerle|1975|loc=15}}

The super-Locrian scale (enharmonically identical to the altered scale) is obtained by flattening the fourth note of the diatonic Locrian mode. For example, flattening the fourth note of the C Locrian scale gives us the C altered scale:

:<score sound="1"> {
\override Score.TimeSignature #'stencil = ##f
\relative c' { 
  \clef treble \time 7/4
  c4^\markup { C super-Locrian scale } des es fes ges aes bes c2 }
}
</score>

The altered scale can also be achieved by raising the tonic of a major scale by a half step. For instance, raising the tonic of the C major scale by a half step (here spelled as an augmented unison) produces the scale C{{music|sharp}}-D-E-F-G-A-B-C{{music|sharp}}:

:<score> {
\override Score.TimeSignature #'stencil = ##f
\relative c' { 
  \clef treble \time 7/4
  cis4 d e f g a b cis2 }
}

</score>

The altered scale can also be the [[major scale]] with all of the notes except the tonic being flattened. For example, taking the C{{music|sharp}} major scale and flattening all of the notes except the tonic produces the C{{music|sharp}} altered scale (see above).