erhythm.org

What It Is

Erhythm is a web-based rhythm learning and creation tool for drummers and percussionists. Its core idea comes from Godfried Toussaint’s research on the “geometry of musical rhythm”: a circle of time is divided into a number of positions, and after users activate beats, the system displays them as vertices and polygons on the circle, turning abstract rhythmic durations into visual, audible, and editable shapes.

Core Features

It is not a traditional video course, but an interactive learning tool. Users can place beats in the Circle Composer, listen to real percussion samples, and observe the resulting polygon shapes. They can also use multi-track layering to create combinations such as kick, snare, hi-hat, and congas. The platform supports Euclidean rhythms, rhythm rotation, time signatures from 2/4 to 12/8, a built-in metronome, count-in, undo/redo, and local autosave. Advanced features include MIDI, WAV, and JSON export, percussion notation display with PNG saving, and an AI Generator that creates rhythms by style, energy, and complexity. The community rhythm library supports browsing, publishing, sharing, and forking.

Pricing and Certificates

The page clearly states that it is 100% free to use, with no ads, no subscriptions, and no data abuse. The project is sustained through voluntary PayPal donations, and donating does not purchase any specific features. The main text does not mention any course certification, completion certificate, or official proof of learning.

Pros and Cons

Its strengths are its intuitive learning approach, especially for understanding syncopation, even distribution, odd meters, and rhythmic structures in world music. Its export capabilities also make it useful beyond teaching, allowing it to fit into DAW-based production workflows. The downside is that it lacks clearly structured levels, practice feedback, teacher-led explanations, and a learning path. It feels more like a “rhythm lab” than a complete course platform. As an independent developer project, its long-term maintenance and customer support capacity are also not described in detail.

Who It’s For and Access in China

It is suitable for drummers, beginner percussionists, music teachers, electronic music producers, and anyone who wants to understand rhythm from a mathematical and visual perspective. The page is mainly in English, so Chinese users will need some background in music and English. The main text does not provide information about access from mainland China, so this is assessed as unknown.