Scale

Scale patterns, spelled scales and the reviewed scale catalog. More...

Collaboration diagram for Scale:

Namespaces
namespace	MCC::Scales
	Reviewed catalog of named scales stored in program memory.

Classes
class	MCC::Scale
	A scale pattern spelled from a root note name. More...
class	MCC::ScalePattern
	Root-independent scale structure: up to twelve ascending degrees. More...

Detailed Description

Scale patterns, spelled scales and the reviewed scale catalog.

MCC::ScalePattern stores up to twelve ascending degrees as diatonic steps and semitones above the root, built at compile time from a degree formula such as "1 2 b3 4 5 b6 b7". MCC::Scale spells a pattern from a root MCC::NoteName, so E major contains G#, never Ab. MCC::Scales holds the named catalog in program memory and reads it through Foundation::Utils::Flash, so on AVR neither patterns nor names occupy RAM. See Music-Domain Specification (SPEC-SCL-*).

const MCC::Scale dMinor =
    MCC::Scales::Make(MCC::NoteName(MCC::Letter::D), MCC::Scales::Id::Minor);
MCC::NoteName sixth = dMinor.NoteAt(6);              // Bb
MCC::Scales::Id id = MCC::Scales::Find("Aeolian");   // Id::Minor

Available when MCC_SCALE is defined. Requires the Interval module and Foundation 2.0.10 or newer.

Catalog and Provenance

Identifiers are stable. Every legacy definition comes from the historical MusicCompositionCore .Scale files under ScaleFlash/ScaleDefinitions; the OLD MCC tree and the copy vendored in the old MIDILAR repository carry the same semitone masks. Spellings are shown from C.

Id	Name	From C	Family	Provenance
0	Chromatic	C C# D D# E F F# G G# A A# B	Symmetric	Legacy Chromatic (sharps)
1	Chromatic (Flats)	C Db D Eb E F Gb G Ab A Bb B	Symmetric	Legacy Chromatic_Flats
2	Major (Ionian)	C D E F G A B	Western	Legacy
3	Minor (Natural Minor, Aeolian, Ethiopian)	C D Eb F G Ab Bb	Western	Legacy; Ethiopian had the same notes and became an alias
4	Harmonic Minor	C D Eb F G Ab B	Western	Legacy
5	Melodic Minor	C D Eb F G A B	Western	New
6	Harmonic Major	C D E F G Ab B	Western	Legacy
7	Major Pentatonic	C D E G A	Western	Legacy
8	Minor Pentatonic	C Eb F G Bb	Western	Legacy
9	Minor Blues	C Eb F Gb G Bb	Western	Legacy
10	Major Blues	C D Eb E G A	Western	Legacy; its name string wrongly read "Minor Blues"
11	Dorian	C D Eb F G A Bb	Modal	Legacy
12	Phrygian	C Db Eb F G Ab Bb	Modal	Legacy
13	Lydian	C D E F# G A B	Modal	Legacy
14	Mixolydian	C D E F G A Bb	Modal	Legacy
15	Locrian	C Db Eb F Gb Ab Bb	Modal	Legacy
16	Algerian	C D Eb F F# G Ab B	Exotic	Legacy
17	Arabic	C D E F Gb Ab Bb	Exotic	Legacy semitones; respelled from F# G#
18	Augmented	C Eb E G G# B	Symmetric	Legacy
19	Pelog	C Db Eb G Ab	Exotic	Legacy (12-TET approximation)
20	Byzantine (Double Harmonic Major)	C Db E F G Ab B	Exotic	Corrected: the legacy mask duplicated Augmented with 6 notes and 7 spellings
21	Chinese	C E F# G B	Exotic	Legacy
22	Diminished (Whole Half Diminished)	C D Eb F F# G# A B	Symmetric	Legacy, including its spelling
23	Egyptian	C D F G Bb	Exotic	Legacy
24	Eight Tone Spanish	C Db D# E F Gb Ab Bb	Exotic	Legacy
25	Enigmatic	C Db E F# G# A# B	Exotic	Legacy
26	Hindu	C D E F G Ab Bb	Exotic	Legacy
27	Hirajoshi	C D Eb G Ab	Exotic	Corrected: the legacy semitones were Iwato's, spelled C Db E# Gb A#
28	Iwato	C Db F Gb Bb	Exotic	New, from the legacy Hirajoshi semitones
29	Hungarian Minor	C D Eb F# G Ab B	Exotic	Legacy
30	Japanese (In Sen)	C Db F G Bb	Exotic	Legacy semitones; respelled from A#
31	Oriental	C Db E F Gb A Bb	Exotic	Legacy
32	Whole Tone	C D E F# G# Bb	Symmetric	Legacy
33	Romanian Minor	C D Eb F# G A Bb	Exotic	Legacy
34	Spanish Gypsy (Phrygian Dominant)	C Db E F G Ab Bb	Exotic	Legacy
35	Super Locrian (Altered)	C Db Eb Fb Gb Ab Bb	Exotic	Legacy

Names in parentheses are aliases accepted by MCC::Scales::Find(). ScaleCatalogTests checks this table, uniqueness of identifiers, names, aliases and patterns, and spelling from all 35 roots with up to two accidentals. On AVR the catalog (about 1.4 KB including names and aliases) is emitted in .progmem.data.