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The Refrain · Sound & Rhythm LabKhaemenes Elementary · Grades 1–5 · Music Computing
Music · Math · Technology · Play → Record → Quantize → Refine → Explain

Sound & Rhythm Lab 🥁

A browser-built music laboratory with programmable computer keys, synthesized tones and percussion, a 16-step beat grid, measure fractions, tempo, recording and quantization, call-and-response, repeating patterns, and live sound-wave visualization.

Grades 1–5Programmable KeyboardWeb AudioBeat GridMeasure FractionsRecord → QuantizeCall & ResponseWaveformLocal Save
96 BPM
Grade 2 Music Mission

Build and repeat an 8-count pattern.

Use the keyboard or beat grid. Listen for a pattern, change one part, and describe what changed.

Programmable Keyboard

Press the computer keys or click the pads. Typing in text boxes will not trigger sounds.

Keyboard ready.
Live waveform monitorNo note playing

Key Mapping Studio

Choose a key to inspect or change its sound.

Recording Take

No recorded events yet.

16-Step Beat & Melody Grid

One 4/4 measureEach step = 1/16 measureStopped

Fractions of a Measure

A four-beat 4/4 measure can be divided into equal rhythmic parts. The grid lets you hear those divisions.

1/1whole measure
1/2half measure
1/4quarter measure
1/8eighth measure

Call

Listen to the pattern.

Response

Play the same rhythm on the keyboard or create your own answering rhythm.

Explain My Pattern

💾 Local-first music computing
Mappings, grid, tempo, and saved patterns stay on this device.
β Beta Program