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🎼 Music Theory for Adults

Scales, chords, and the circle of fifths, the grammar behind every song.

lessons

~15 min

to learn

🗣️ Language

subject

Adults

level

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What you’ll learn

Explain notes, intervals, scales, keys, and basic rhythm as the building blocks of music.Western music uses twelve pitches per octave, and the distances between them, intervals, form scales that define a key. Rhythm and meter organize those pitches in time, giving music its pulse and momentum.
Build triads, read the circle of fifths, and recognize common chord progressions.Chords are stacked intervals from a scale, and the circle of fifths maps how keys relate. Progressions like I-IV-V create tension and resolution, and together melody, harmony, and rhythm form complete music.

Questions this course answers

How many notes are in one octave in standard Western music?

Western music divides the octave into twelve equally spaced pitches before the pattern repeats.

A perfect fifth is how many half steps above the starting note?

Seven half steps make a perfect fifth, which fits both major and minor without changing character.

What does a time signature of 4/4 tell you?

In 4/4, each measure holds four beats and the quarter note counts as one beat.

A major triad is built from a root, a major third, and a:

A major triad stacks a root, a major third, and a perfect fifth, such as C-E-G.

Moving clockwise around the circle of fifths, each step:

Clockwise motion moves up by perfect fifths and adds a sharp to the key signature each step.

In the key of C major, the I-IV-V progression uses which chords?

The I, IV, and V chords in C major are C, F, and G, a progression common across many songs.

Grounded in trusted sources

The Complete Musician, Steven G. Laitz (Oxford University Press, 4th ed., 2016)
Tonal Harmony, Stefan Kostka and Dorothy Payne (McGraw-Hill, 2018)
Circle of fifths, Wikipedia (en.wikipedia.org/wiki/Circle_of_fifths)
Berklee Online, The Circle of Fifths (online.berklee.edu/takenote)
musictheory.net, Lessons (musictheory.net/lessons)

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

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