The Chord Wheel
The Chord Wheel is based on the “Circle of Fifths”. The Circle of Fifths visually conveys the relationships between the various chords. The Chord Wheel is a handy tool that most beginners welcome. You can set the dial to whatever key you want and the Chord Wheel indicates what chords ‘work’ with that key.
So many beginners don’t know where to go from one song component to another and this can be a great help.
You can purchase it here.
Other Alternatives to the Chord Wheel (found on Reddit)
List of Chords:
https://chordcolors.com/chords
List of Scales:
https://chordcolors.com/scales
List of Chord Progressions:
https://chordcolors.com/progressions
If you’d like to learn more about theory for songwriters, rather than reinvent the wheel, (not referring to the Chord Wheel) I recommend visiting https://organizingsound.com/music-theory-for-songwriting/
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Jim Bruno's Songwriting Class 