Series of instruments, for free online, they use Just Intonation, they do not use The Western Music System (aka 12-Tone Equal Temperament)... I postulate technology is a catalyst for the advancement of music theory, we should basically go back to first principles, and be highly discerning regarding which ideas make sense going forward and what historical concepts do not. For example, "key changes" were a mechanical challenge that's incredibly simple in Digital Music Theory. We're not just changing keys we are changing notes, the main purpose of these instruments is the intuitive mutability. This is an empirical approach to music theory in that, while Kepler theorized a master scale within the planets, we can test and experience notes to discern whether or not they sound good or make sense within a particular context, rather than rely merely on what we think should make sense. People think that Just Intonation does not work because they get unexpected values for notes sometimes, but if they actually perceived the data, they would see that harmonics aren't mistakes, simply another context.

Aries: for physical qwerty keyboard devices

Rat: touchscreen and/or mobile devices

‡ both are in effect demo versions and cannot save to database

Many people ask, why? Well, I don't think 12-TET is continuing to evolve in a meaningful way. The amount of music being produced now has significantly increased, that means the oversaturation from how many times the system has been used is increasing exponentially. That's not a good thing, it's a finite system, defined by flaws, it was never meant to be a definitive solution, only to solve the standardization problem at that time. And it worked, at that time, we have the entire history of music which will act as a precursor to the next phase in musical evolution, contingent on our ability to create the infrastructure necessary to support that next phase in our evolution. Which is why I created this infrastructure. I'm not exactly sure why people are so against music theory changing, there's a lot of sunk cost in our current infrastructure, and I'd never take for granted people's capacity to be bad at music theory. Ask a musician what 12-TET is I'd say more likely than not they don't know, they assumed their system is simply what music is, I certainly did for 15 years of musicianship.

Digital Music Theory

an elegant & sophisticated music system