Music AcDec PowerPoint

Definition: Also called common-practice harmony, it describes the system organizing pitch and harmony typical to Western music.
Historical Context:
- Developed in Europe during the Middle Ages, formalized by about 1750.
- Despite changes and challenges from composers and non-Western traditions, common-practice tonality remains prevalent in Western music today.

Definition: A chord consists of three or more pitches sounding simultaneously.
Example: Creating a chord can be as simple as pressing down a book on a piano keyboard.
Common Types of Chords:
- Triads:
- Definition: A three-note chord comprising two intervals of a third.
- Qualities:
  - Major triad (M): Major third intervals between the lower two pitches and a minor third above.
  - Minor triad (m): A minor third on the bottom with a major third above.
  - Diminished triad (d): Composed of two minor thirds.
  - Augmented triad (A): Composed of two major thirds.
Triad Structure: The lowest note in a triad is termed the root, the middle note is the third, and the top note is the fifth.
- Root Position: When the root is at the bottom, the chord is said to be in root position.

Definition: A triad can be inverted by moving any pitch up or down an octave.
- First Inversion: The third note is on the bottom. Indicated as "6" after the chord symbol.
- Second Inversion: The fifth note is at the bottom. Indicated as "6/4".
Chord Arrangement: The order of the pitches may vary, and any of the triad's pitches can be duplicated in the same or different octaves without altering its categorization as a triad.

Definition: In music theory, a key is the set of pitch relationships forming the foundation for a piece or section of music.
Key vs. Piano Key: The term "key" in this context refers to note relationships (not physical keys on an instrument).
Tonic Pitch: The gravitational center of a key is the tonic pitch, which also names the key itself (e.g., a piece is in "the key of D" when its tonic pitch is D).
Major/Minor Distinction: The major or minor quality of a key relies on specific scale degrees - 3, 6, and 7.
- C Major: Usually interpreted as "the key of C" unless otherwise specified.

Definition: A set of sharps or flats is placed at the beginning of each staff to indicate the music's key.
Function: The key signature indicates which seven pitches constitute the scale, by denoting which will undergo regular sharping or flatting.
Example: An F♯ in the key signature implies all F notes must be raised unless canceled by a natural sign.
Scales with Specific Key Signatures:
- G Major and E Minor scales uniquely require only an F♯ in their key signatures.

Structure of Key Signatures:
- There are fifteen major and fifteen minor scales, each corresponding to a key of the same name.
- The major scales’ pitches align with natural minor keys following a specific order.
Circle of Fifths: Visual representation showcasing the relationship between keys, with major keys plotted clockwise and minor keys counterclockwise.
Key Characteristics: C has no sharps/flats; G major incorporates one sharp (F♯), while D rises one more sharp (C♯).
- Continuing clockwise, each key ascends a perfect fifth and adds another sharp until reaching seven sharps (C♯ major).
- Moving counterclockwise begins the addition of flats, starting from C down to F♭.

Definition: A succession of chords or intervals moving from dissonance to consonance.
Dissonance vs. Consonance:
- Dissonance: The sound quality perceived as unstable or tense, leading the listener to desire resolution.
- Consonance: The quality of sounds that provide a sense of stability or rest.

Special Role: Apart from the tonic, the dominant chord (V) is crucial as it comprises the leading tone (^7) and the fifth scale degree, both seeking resolution to the tonic (^1).
Pull of the Dominant: Other chords typically lead to the dominant chord, termed predominant harmonies (e.g., ii and IV).
Common Progressions: The predominant-dominant-tonic progression is prevalent, often formed as ii-V-I or IV-V-I.

Definition: Enhances the dominant triad (V) by adding a minor seventh from the root, thereby fortifying its resolution pull to the tonic triad.
Example: In C major, G-B-D (the dominant triad) evolves into G-B-D-F (the seventh chord).
Tritone Inclusion: The dominant seventh chord incorporates a tritone between ^7 and ^4, creating increased tension that drives towards resolution to tonic.

Complex Harmony: As common-practice harmony has evolved since 1750, triads remain foundational, with the introduction of additional pitches for embellishment, enhancing harmonic richness.
Chord Types:
- Triads are fundamental; when using additional notes (e.g., sixths, sevenths), tones are labeled as inclassically rich.

Complex Harmony involves the introductions of chromatic pitches complicating triadic structures, expanding compositional options and expressiveness.
Modulation: Transitioning between keys, often initiated by leveraging accidentals to establish a dominant seventh chord before resolving to the new tonic.

Texture: Determines the number of musical elements occurring simultaneously, categorized as:
- Monophony: A single, unaccompanied melodic line.
- Homophony: A primary melody supported by a secondary harmonic accompaniment.
- Polyphony: Multiple distinct melodies interacting with independence.
- Heterophony: Variants of a single melody sung or played simultaneously with slight variations.

Definition: Refers to the instruments and combinations used in a piece, impacting the sound significantly.
Variation and Arrangement: Different instruments play melodies differently; arrangement adjusts who plays which roles and frequencies.

Dynamics: Describes volume levels; added expressiveness through gradual changes (crescendo/decrescendo).
Articulation: Mechanics of sound initiation and cessation, defining qualities such as staccato and legato.
Ornamentation: Localized embellishments, often improvised or added for dramatic effects.

Perception: Comprehension of musical form involves auditory memory and anticipation, aiding in recognizing tension and release dynamics during listening experiences.

Motive: The smallest identifiable recurring musical idea. Example from "Happy Birthday" includes the first four notes.
Phrase: A cohesive musical thought; pairs of phrases are commonly structured as antecedent and consequent.
Cadence: A dictionary of pauses or resting points with varying terminal strength in musical phrases.
Theme: A primary sequence of phrases creating a complete melody that recurs in compositions.

Variation structure: Theme and variations depict a central melodic idea followed by altered repetitions.
The Twelve-Bar Blues: A repeated twelve-measure chord structure, typically alternating melodies.
Improvisation: A dynamic performance style prevalent in jazz and related genres, allowing performers to elaborate spontaneously.

Sound and Structure: Music is organized sound, harmonic complexities are evolutionarily refined yet bridged through common practice principles, emphasizing resolution from dissonance, melodic coherence, and structural layering.