Twelve TheoryMath + Music Playground

Explore interactive music theory and music by numbers through Free Play, Math Mode, Chord Game, the Note Stage, Circle Counting, the Triad Chart, Church Modes, the Counterpoint Game, Harmonic Cone, the Harmonics Quiz, Frequency Chart, Harmonic Wave, Waveforms, Harmonic Polygons, Tuning String, Sheet Music, Musical Circles, and Ear Training.

Beginner · First species1 note against 1 note
Interactive module

Counterpoint game

Write an independent upper melody, learn from exact rule feedback, then hear both voices together.

+3 / −9 = minor 3rd / major 6th+4 / −8 = major 3rd / minor 6th+7 / −5 = perfect 5th / perfect 4th+8 / −4 = minor 6th / major 3rd+9 / −3 = major 6th / minor 3rd
Challenge1 / 4
First species · Rising six

Build a smooth upper melody over this rising lower line.

0 / 6 upper entries
1:1Every vertical interval should be consonant; favor contrary and oblique motion.
Upper
Beat 1?choose1:1 · strong
Beat 2?choose1:1 · strong
Beat 3?choose1:1 · strong
Beat 4?choose1:1 · strong
Beat 5?choose1:1 · strong
Beat 6?choose1:1 · strong
Lower
Beat 11Ccantus · whole
Beat 23Dcantus · whole
Beat 35Ecantus · whole
Beat 46Fcantus · whole
Beat 58Gcantus · whole
Beat 610Acantus · whole
Choose Beat 1 · strongNotes in C major
Number row: 1–9, 0 = 10, − = 11, = = 12

The game places each number in the nearest singable upper register. Strong, weak, preparation, tie, and resolution labels determine which rule applies.

Choose one upper note for each lower note.

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