Chapter 3

Introduction to Harmony

This fundamentals chapter initiates a study of harmony that is threaded throughout subsequent composition chapters in Part IIa. In this chapter, you will be introduced to major and minor scales, key signatures, intervals, and the concepts of consonance and dissonance before exploring triads and seventh chords in major and minor keys, inverted chords, and related chord symbols. 


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harmony

a primary component of music relating to pitch combinations such as chords.

scale

an ordered series of notes arranged in a specific pattern of intervals that encompasses an octave.

chromatic scale

an ordered series of half step intervals encompassing an octave.

whole tone scale

an ordered series of whole step intervals encompassing an octave.

diatonic collection

a collection of seven different notes (plus a repeated note, creating an octave interval above the first) arranged in such a way that five of the adjacent notes are separated by whole steps while two are separated by half steps; these half step intervals are additionally spread apart from one another as evenly as possible within the collection.

tonic

a focal note that serves as a key’s gravitational center within a piece of tonal music.

scale degree

a member of a scale that is indicated by a caret-topped number reflecting its position relative to tonic.

interval size

an indication of the general distance between pitches expressed as a number reflecting the sheer number of letters within the musical alphabet A–G that are involved in the span from the first note to the second note.

interval quality

a secondary indication of the specific distance between pitches that form more general interval sizes, expressed as a letter.

enharmonically equivalent intervals

intervals that sound the same and possess the same number of half steps but are labeled differently (and function differently), as their constituent pitches are spelled differently.

tritone

a dissonant interval that spans six half steps (or three tones) and may be spelled as an augmented fourth or diminished fifth.

interval inversion

a change in the pitch ordering of an interval’s constituent tones, such as when the lower note of an interval becomes the higher note by being placed in a higher octave (or vice versa).

compound intervals

intervals that are larger than an octave.

chord extensions

chord members that create compound intervals above the root.

dissonance

the perceptual sensation of tension engendered by certain intervals, notably those whose frequency ratios are relatively complex.

consonance

the perceptual sensation of stability engendered by certain intervals, notably those whose frequency ratios are relatively simple.

key signature

a patterned arrangement of accidentals in music notation that signifies the key of a given section or piece of music (by including the related scale’s accidentals).

relative keys

keys that share the same key signature but possess different tonics.

parallel keys

keys that share the same tonic but possess different key signatures and different modes.

natural minor

diatonic mode that is similar to a natural minor scale with a lowered second degree and features a step pattern of H–W–W–W–H–W–W.

subtonic

the seventh degree of a scale that is positioned a whole step below tonic.

harmonic minor

the minor scale that is similar to a natural minor scale but possesses a raised seventh degree, creating a leading tone. The harmonic minor scale has the interval pattern W–H–W–W–H–W+H–H, with “W+H” corresponding to the interval of an augmented second.

melodic minor

the minor scale that is similar to a natural minor scale but with raised sixth and seventh degrees in its ascending form, such that its final ascending tetrachord is the same as that of the major scale. The descending version of the scale is the same as the natural minor scale.

triad

a tertian harmony composed of three pitch classes.

seventh chord

a tertian harmony composed of four pitch classes.

voicing

the specific arrangement of a harmony in pitch space, pertaining to the spacing, doubling, and/or omission of the chord tones.

close position

a voicing that involves chord tones placed as close as possible to one another in pitch space.

open position

a voicing that involves chord tones placed relatively far apart in pitch space, such that the chord spans more than an octave.

contrapuntal voices

melodically independent layers in a piece of music that combine in a coherent fashion.

bass

the lowest-sounding contrapuntal voice within a musical texture.

arpeggiation

a melodic and rhythmic figure involving a succession of leaps between chord tones.

Alberti bass

a particular style of bass arpeggiation that is characterized by a pitch contour sequence of low-high-medium-high.

Roman numerals

analytical symbols used to identify chords’ root scale degrees, qualities, and functions within a key.

root position

a chord position featuring the root as the lowest sounding note.

first inversion

a chord position featuring the chordal third in the bass.

second inversion

a chord position featuring the chordal fifth in the bass.

third inversion

a chord position featuring the chordal seventh in the bass.