Unit
- Pitch and note names: Music is built from discrete pitches named A through G, with sharps and flats filling the gaps. Each pitch is a unique frequency, and the distance between two adjacent pitches is a half step. The chromatic scale includes all twelve pitches within an octave, ascending or descending by half steps. Composers use chromatic scale for color and transition.
- Octave equivalence: Notes separated by an octave share the same letter name and double the frequency. This property allows us to extend melodies and chords across registers while maintaining harmonic identity. The octave is the most fundamental interval in music theory.
- Staff notation: The five-line staff, treble and bass clefs, ledger lines, and accidentals (sharp, flat, natural) are the standard tools for notating pitch. Understanding this system is essential for reading and writing music accurately across instruments.
- Enharmonic equivalents: Pitches like C sharp and D flat sound the same but are written differently depending on key context. Recognizing enharmonic pairs helps in reading and composing in various keys and modulates smoothly between them.
- Chromatic scale construction: Starting on any note, play every successive half step up to the octave. This scale contains all twelve pitches and serves as the source for all tonal material. Its symmetrical structure makes it useful for creating tension and exploring non-diatonic tones.
- Practical application on a keyboard: Visualizing the chromatic scale on a piano keyboard: white keys are natural pitches, black keys are sharps and flats. The distance between adjacent keys, including the gap between E and F (no black key), is always a half step. This tactile layout aids composition.
- Role in melody and harmony: Chromatic notes are used as passing tones, neighbor tones, or appoggiaturas to add tension and release within a diatonic framework. Chromaticism can enrich chord progressions, leading to extended harmonies like dominant seventh or altered chords.
- Notation and MIDI: In digital composition, MIDI note numbers represent pitches (middle C = 60). Understanding the chromatic scale helps in programming sequences and mapping pitch ranges for different instruments in a DAW.
- Whole steps and half steps: A whole step consists of two half steps. In the chromatic scale, every adjacent note is a half step. Diatonic scales, such as major and minor, are constructed using a specific pattern of whole and half steps. For instance, the C major scale follows the pattern W W H W W W H. This distinction is fundamental for building scales and understanding melodic motion.
- Interval names and distances: The interval between two pitches is named by its size in half steps and its quality (major, minor, perfect, augmented, diminished). A chromatic half step (e.g., C to C#) is a minor second. Recognizing intervals both by ear and notation helps composers control tension and resolution, and is essential for effective voice leading in chord progressions.
Design Principle
Principle: Economy of Material
Definition: Using a limited set of pitches (e.g., a scale) as the basis for a composition, rather than the full chromatic range, creates coherence and unity. The composer deliberately chooses which chromatic notes to include for expressive effect.
Application: In a diatonic composition, restrict primary melodic and harmonic material to a specific scale (e.g., C major). Introduce chromatic notes sparingly as passing tones or to modulate to a new key. This approach ensures that chromaticism remains impactful and purposeful.
Quick Revision
- Notes are named A-G with sharps and flats; the chromatic scale contains all 12 half steps in an octave.
- Octave equivalence allows same pitch class across registers.
- Staff notation uses clefs and ledger lines to indicate pitch.
- Enharmonic equivalents like C#/Db sound the same but are context-dependent.
- Chromatic scale provides all pitches for non-diatonic color.
- Economy of material principle: limit chromaticism for coherence.