May 27, 2010 · Of course, we’ve already encountered these exact same formulas – but with different names. For instance the Maj13 formula is the same as the ordinary major scale/Ionian mode; the min13 formula is the Dorian mode, while the dominant 13th formula is the same as the Mixolydian mode. This means that a Maj13th chord implies the Ionian mode ... Miscellaneous This section contains diadic "fifth" (2 note 'chords'), the "Sus" chords, and the #11. A #11 contains a perfect fifth as well as a sharp eleven, (which is the same note as a flat five but an octave higher). We can figure out what chord each one is by associating each root with it's relative scale. For example, the second chord in the sequence starts with a D so we can use the D major scale to find out what kind of chord it is, using the formulas we have discussed so far. For this then, we will need to know how the notes D, F and A relate to the D ... Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents. In this free keyboard chords theory lesson you will learn simple formulas to help you find absolutely any chord on the piano keyboard without having to rely on bulky chord charts or written music. Understanding these keyboard chord formulas will make a big difference in your ability to enjoy making music on piano or electronic keyboard.