[tejohnso]

Pretty good as a visual and auditory reference. But it could use a bit more detail on the why / how. For example, it shows "C major scale" with notes CDEFGAB. But then when you click the Cmaj button it only plays CGE. Why only three notes? A chord can have more than three. Why those specific ones? Why is it that notes CDEFGAB make up the C major scale?

I guess it gets complicated, and that's why there are so many links to external sites for more information.

[andybak]

I'm not sure it's meant to teach music theory. As you observe, that would get complicated.

> But then when you click the Cmaj button it only plays CGE.

Because those are the notes in Cmaj

> Why only three notes? A chord can have more than three.

Yes but not Cmaj.

I don't know if you're asking these questions yourself or putting yourself in the place of someone who is learning theory - but it seems a strange criticism of a single page interactive website that it fails to explain the vast amount of arbitrary information embedded in western standard practice.