The Music Projection Ontology allows the formalisation of the musical entities that can be subject of an annotations. This ranges from traditional musical notation (e.g. note, chords) to informal annotations (e.g. mood, danceability).
Music Projection Ontology
A diatonic step is an absolute step with respect to the reference note, i.e. a fifth.
Diatonic step
Relation between a pitch class and an accidental.
has accidental
The relation between an ambitus and the type it is classified as.
has ambitus type
The relationship between a cadence and a type it is classified as.
has cadence type
Relation between a note and its duration.
has duration
The relation between a mode and a type it is classified as.
has mode type
Relation between a note and its pitch.
has pitch
The relation between a pitch and the pitch class represented.
has pitch class
Relation between an interval and its quality.
has quality
The value of an interval is the amount of pitch classes it encompasses.
has specific interval value
The reference pitch class of an interval, from which a different pitch class can be obtained by shifting by the adequate number of pitch classes.
has starting pitch class
Relation between an accidental and a pitch class.
is accidental of
The relationship between an ambitus type and an ambitus it classifies.
is ambitus type of
The relationship between a cadence type and a cadence it classifies.
is cadence type of
Defines the relationship between a chord and the pitch class or pitch it is composed of.
is composed of
Relation between a duration and a note it is used in.
is duration of
The relationship between a mode type and a mode it classifies.
is mode type of
Relation between a pitch class and the pitches it is instiatied as.
is pitch class of
Relation between a pitch and the note it is used in.
is pitch of
Relation between a quality and an interval.
is quality of
The amount of pitch classes ranged by an interval.
is specific interval value of
The interval a PC is reference of.
is starting pitch class of
Relates a chord to its inversion.
has inversion
Defines the octave of a PC or of a pitch.
has octave
Defines the staff line of a clef.
is on staff line
Number of diatonic steps spanned by an enharmonic interval.
spans over
An accidental is a symbol used to indicate that a pitch class should be raised or lowered.
Accidental
The range of a melody in Gregorian chant.
ambitus. In Latham, A. (Ed.), The Oxford Companion to Music. : Oxford University Press. Retrieved 28 Jul. 2023, from https://www.oxfordreference.com/view/10.1093/acref/9780199579037.001.0001/acref-9780199579037-e-235.
Ambitus
The type that classifies an ambitus.
Ambitus type
A melodic or harmonic motion conventionally associated with the ending of a phrase, section, movement, or composition.
Nagley, J., & Whittall, A. cadence. In The Oxford Companion to Music. : Oxford University Press. Retrieved 28 Jul. 2023, from https://www.oxfordreference.com/view/10.1093/acref/9780199579037.001.0001/acref-9780199579037-e-1072.
Cadence
The type that classifies a cadence.
Cadence type
A chord is a vertical set of notes played at the same time.
Chord
A clef is used to indicate which notes are represented on each line and space of a musical staff.
Clef
A duration is the amount of time that a music projection lasts.
Duration
An enharmonic interval (EIV) is the difference between two EPCs E.g. 5 semitones
Hentschel, J., Moss, F. C., McLeod, A., Neuwirth, M., & Rohrmeier, M. (2022). Towards a unified model of chords in western harmony.
Enharmonic interval
EIV
An enharmonic pitch class (EPC) is a numeric value from 1 to 12. It represents an absoute value for a pitch class. It is not possible to identify modfiers, becuase of the existance of enharmonic pitches. E.g. 9
Enharmonic pitch class
EPC
A flat accidental is an accidental that lowers a pitch.
Flat accidental
A generic interval (GIV) is the difference between two GPCs E.g. a 3rd
Generic interval
GIV
A generic pitch class (GPC) is a symbol from A to G that representes a generically a pitch class, without taking into account modifiers and octaves. E.g. C
Generic pitch class
GPC
A generic scale degree (GSD) is a number from 1 to 7 that defines a one-to-one mapping from a GPC to a SIV. E.g. 3
Generic scale degree
GSD
The quality of an interval.
Interval quality
A key is the combination of a mode and a tonic PC,
Key
In early medieval theory the word modus was occasionally used to mean ‘interval’—for example by Hucbald of Saint-Amand (c.840–930) and Guido of Arezzo (c.991–after 1033). This meaning survived in Ornithoparcus's Musicae activae micrologus (Leipzig, 1517) and was retained in John Dowland's translation of that work, Of Moodes, or Intervals (London, 1609). It is last found in the writings of J. H. Buttstedt (1666–1727). There [...] other meanings better known today [...] that of ‘scale’ or ‘melody type’ [...]. [...] [It] covers a wide range of definition, from simple scales—arrangements of tones and semitones sometimes without any implication of a ‘tonic’ or main note—to a particular and typical melodic style or collection of motifs, perhaps with a definite ‘tonic’ and other notes in a hierarchy of importance—a meaning often found in discussions of non-European music, where melody types are widely used in non-written musical traditions [...].
Hiley, D. mode. In The Oxford Companion to Music. : Oxford University Press. Retrieved 28 Jul. 2023, from https://www.oxfordreference.com/view/10.1093/acref/9780199579037.001.0001/acref-9780199579037-e-4468.
Mode
The type that classifies a mode.
Mode type
A note is a pitch that is played for a specified duration.
Note
A sharp accidental is an accidental that changes a pitch in an higher one.
Sharp accidental
A specific interval (SIV) is the difference between two SPCs E.g. a majord 3rd
Specific interval
SIV
A specific scale degree (SSD) is a number from 1 to 7 plus an accidental that defines a one-to-one mapping from a GPC to a SIV. E.g. b3
Specific scale degree
SSD
A spelled pitch class (SPC) is a GPC plus an accidental. E.g. C#
Spelled pitch class
SPC
An augmented interval can further qualify each major interval and fourths and fifths as well.
Augmented interval
A diminished interval can further qualify each major interval and fourths and fifths as well.
Diminished interval
Two flats.
Double flat
Two sharps.
Double sharp
One flat.
Flat
G clef, also known as a treble clef or a french violin clef. It is placed on the second line of a staff.
French violin clef
G clef
Treble clef
A major interval can further qualify a second, third, sixts or sevenths.
Major interval
A minor interval can further qualify a second, third, sixts or sevenths.
Minor interval
A natural accidental is an accidental that cancels previous accidentals.
Natural
A perfect interval qualifies a unisons, octaves, fourths and fifths.
Perfect interval
One sharp.
Sharp
Three flats.
Triple flat
Three sharps.
Triple sharp
Interval
An interval is a difference between two pitch classes.
A pitch is a perceptual property of a sound, related to a frequency. It is defined as the combination of a pitch class and an octave.
Pitch
Pitch class
The set of alla pitches that are a whole number of octaves apart.