In the article: "There's also 7th chords, Augmented chords (+), and Diminished (º) chords. As far as we're concerned, there's a lookup table that lets us turn

In the article: "There's also 7th chords, Augmented chords (+), and Diminished (º) chords. As far as we're concerned, there's a lookup table that lets us turn these chords into notes."