What's the difference between major and minor?
Major sounds brighter and minor gives a darker sound. Read on to learn more about major and minor.
July 23, 2025
Music theory app for Chords, Scales, and Ear Training
Learn music theory step by step with Sonid. Practice intervals, scales, chords, and harmony in short sessions designed for daily progress.
Built for learners, teachers, and self-taught musicians worldwide.
Build your theoretical knowledge
Every musician needs fundamentals, practice, and guidance. Sonid gives you a complete learning system that's fun and easy to use.
Feature
Understand how music works, step by step
Sonid helps you learn music theory in a clear order, one concept at a time. Start with notes and intervals, then build into scales, chords, modes, and harmony.
Each lesson connects directly to real playing, so you do not just memorize theory, you use it. Learn faster, hear progress sooner, and build confidence on your instrument.
Play with more freedom and control
When you understand theory, you make better musical choices. Sonid teaches you how to move from basic building blocks to advanced sounds without getting lost.
Train chord quality, inversions, substitutions, and modal color in practical steps. From your first triads to lush jazz harmony, every lesson is built for real results.
Practice daily with the Sonid app
Use the app for guided exercises in intervals, ear training, chords, scales, and modes. Short sessions make it easy to stay consistent and keep improving.
Use the web libraries as your fast reference for notes, intervals, chords, and scales whenever you study, teach, write, or rehearse.
Train your ears, play with confidence
Recognize interval color and harmonic movement faster.
Hear what fits before you play.
Build melodies in any key
Use scales, modes, and target notes with intention.
Create stronger melodic lines over real progressions.
Use richer chords and voicings
Learn inversions and substitutions that add color.
Make your harmony sound more musical and intentional.
Write songs that feel stronger
Turn theory into progressions, tension, and release.
Compose with clearer direction and emotional impact.
Read our blog to level up your learning!
Your weekly dose of music theory wisdom, practice tips, and behind-the-scenes updates to keep your music adventure exciting ?
Q&A: Music theory helps you listen more closely
We reached out to Flumpy Duck and asked him some questions. With 26784 points he has the most XP of all users!
July 23, 2025
What's the difference between a sharp and a flat?
Sharps and flats are complicated. Read more to know the difference between them.
July 23, 2025
Ear training Spotify playlist - Perfect Prime
Today we start something new: Sonids Spotify Playlists! We start with the Perfect Prime interval.
July 23, 2025
Ear training Spotify Playlist - Major Seventh
We've made a new Spotify Playlist this week! This time we take a look at the major seventh and teach you how to identify it by ear.
July 23, 2025
Music theory basics: the major scale
In this article you will learn more about the major scale.
July 23, 2025
Built for your learning, not ours.
Bring your favorite instruments and learning style. We'll handle the theory (not the practice ?)
We're on a mission to teach music!
Comprehensive music education shouldn't require conservatory training or expensive lessons. Our mission is to make music theory accessible to everyone.
Music theory app for real musicians
Sonid is a music theory app built for practical progress: notes, intervals, scales, chords, modes, and ear training in one guided learning flow.