In Search of the Fourth Chord - Wikipedia
In Search of the Fourth Chord - Wikipedia
The Red Chord - Wikipedia
In Search of the Lost Chord - Wikipedia
Therion
Dividing a circle into areas - Wikipedia
Third (chord) - Wikipedia
The Beatles Complete Chord Songbook: Paul McCartney: 9781974805983
Chord substitution - Wikipedia
Major chord - Wikipedia
EcoQuest brought Wikipedia to Sierra text adventures - Polygon
Perfect fourth - Wikipedia