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  • Beginner
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  • About 85 min
  • 11 steps · 2 quizzes

How Music Works — Rhythm, Pitch & Harmony

A hands-on tour of how music works, from a vibrating string to a full four-chord loop — no instrument and no music reading needed.

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28 lessons · used by 2 teachers

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11 steps · 2 quizzes · about 85 minutes · open any step

  1. Welcome: how music worksStart hereEvery song you love is built from three things you can see, hear and change: pitch, rhythm and harmony. Today you'll take them apart.InteractiveHands-on · 6 min
  2. Sound is vibrationEvery sound starts with something moving back and forth. A plucked string swings, pushes the air next to it, and that push travels outward as a wave of squeezed and stretched air. When it reaches your ear, the pressure goes up and down — and you hear it.InteractiveHands-on · 6 min
  3. Frequency and amplitudeA waveform has two things you can change: Frequency — how many vibrations per second, measured in hertz (Hz). More vibrations = a higher pitch. Amplitude — how far it swings. A bigger swing = louder. Try it: press Play, then move each slider on its own.InteractiveHands-on · 6 min
  4. Octaves: the same note, higherPlay the A on a piano, then the next A up. They sound like the same note, just higher. That's an octave — and the higher one vibrates exactly twice as fast. Try it: tap a few keys, then press Climb one octave and watch the frequencies grow.InteractiveHands-on · 6 min
  5. Rhythm: the steady pulsePitch is what you hear; rhythm is when. Under almost every song is a steady beat. Tempo is how fast the beat goes, in beats per minute (BPM). Beats are grouped into bars. The time signature says how many: 4/4 has four beats per bar, 3/4 has three.InteractiveHands-on · 6 min
  6. Build a beatA drum machine splits each bar into 16 small steps — four for every beat. Each square is one moment; turn it on and that drum plays there. Kick — the low thump, usually on strong beats. Snare — the sharp crack.InteractiveHands-on · 6 min
  7. Check: sound and rhythmQuiz · 5 questions
  8. Why some notes sound good togetherTwo notes played together form an interval. Some intervals sound smooth, others tense. One classic explanation is their frequency ratioInteractiveHands-on · 6 min
  9. Scales: a pattern of stepsA scale is a set of notes that sound like they belong together. You build one by stepping up from a starting note in a fixed pattern: a half step = the very next key (black or white); a whole step = two half steps.InteractiveHands-on · 6 min
  10. Chords: three notes at onceA chord is three or more notes played together. The most common is the triad: take a note from the scale, skip one, take the next, skip one, take the next. Major chord: 4 half steps, then 3 — bright. Minor chord: 3 half steps, then 4 — darker.InteractiveHands-on · 6 min

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