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For teachers & schools

Learn music theory with Sonid

Learn music theory with practical tools, guided app exercises, and a complete reference for chords, scales, notes, intervals, and modes.

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For beginners
For guitarists
For pianists
Ear training
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Theory

Intervals
Interval playlists
Chords
Scales
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Notes reference

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Music Theory Playground
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Why and how to play with a metronome
Tuner

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Basics
Ear training
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Created byMartijn van der Eijk

Written byLida van der Eijk

Vectors byFreepik

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Music Theory Video SeriesA step-by-step guide to music theory fundamentals. These 60-second videos provide a clear, structured path to understanding how music works, optimized for a full-screen learning experience.

Music Theory ShortsMaster music theory concepts in 60 seconds or less. Quick, vertical videos designed to give you essential theory knowledge in a fast-paced, mobile-friendly format.

@copyright Martijn van der Eijk 2026

Meet the Sonid Team - Our Story & Mission