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I'd like to share something I've been working on: guitardashboard.com. It's something I've built initially to aid my own study of diatonic modes and chords on the guitar, but I'm also hoping that others might find it useful. Some features:
I'm self taught when it comes to music theory, so I'd really like to hear any comments, bugs, suggestions. It's open source on GitHub with an MIT licence, so feel free to take the code and use it for your own purposes. Send me a pull-request if you're of the programmerish persuasion. Links under the 'info' menu.