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🎼 Music Theory

Crack the code behind melody, harmony, and the circle of fifths.

lessons

~30 min

to learn

🗣️ Language

subject

Teens

level

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What you’ll learn

Identify the twelve-note system, define intervals, and distinguish consonance from dissonance and rhythm.Music theory is built on twelve repeating pitches separated by semitones. Intervals like the perfect fifth and major third are the raw material of melody and harmony, and the interplay of consonance, dissonance, and rhythm gives music its shape and drive.
Construct major and minor scales and triads and read key signatures.Scales follow fixed whole- and half-step patterns that define major and minor sounds. Triads stack thirds to form chords, and every key uses a key signature of sharps or flats to keep its scale pattern intact.
Use the circle of fifths, common chord progressions, and melodic phrasing to understand and create music.The circle of fifths maps how keys relate. Chord progressions like I-IV-V-I and I-V-vi-IV drive songs, and melodies shaped into phrases interact with harmony to make music feel complete.

Questions this course answers

How many semitones are in a perfect fifth?

A perfect fifth spans seven semitones and is considered a very consonant, stable interval.

What is the smallest interval between two adjacent piano keys called?

A semitone (half step) is the smallest distance between two adjacent keys, black or white.

What do composers use tension and release for?

Moving between dissonance and consonance builds tension and release, a core tool for musical drama.

What is the whole/half step pattern of a major scale?

The major scale follows whole, whole, half, whole, whole, whole, half.

Which interval makes a triad sound major rather than minor?

A major third above the root creates the bright major quality; a minor third creates a minor quality.

How many sharps or flats does C major have?

C major has no sharps or flats, which is why it is often the first key learned.

Grounded in trusted sources

Berklee Online, "Circle of Fifths: The Key to Unlocking Harmonic Understanding" (online.berklee.edu)
"Circle of fifths," Wikipedia (en.wikipedia.org/wiki/Circle_of_fifths)
University of North Alabama, A Practical Approach To Understanding Music Theory (una.pressbooks.pub/music-theory)
Musical U, "The Ultimate Guide to the Circle of Fifths" (musical-u.com)

Every Wunder lesson is built from real, reputable sources — never invented.

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