BUILDING CHORDS......COMPOSITION DES ACCORDS
                 (very easy  .....très simple en fait)

   ESSENTIEL   .....MAIN    :  MAJOR or MINOR CHORD (= 3 NOTES)

   F =Fondamentale=Root = note who takes its name to the chord
  3  = Tierce majeure = Major 3rd   (R + 2 Whole Tone) F+2Tons           (Major chords)
  3-  = Tierce mineure = Minor 3rd  (R + 1 WT& Half) F+1T 1/2               (Minor chords)
  5   = Quinte juste = 5   = R + 3 WT&Half = F+ 3T 1/2

   THEN
    7th CHORD = 4 NOTES  ( R   3    5  and 7th) like  C7
                                          (C   E    G        Bb)
   7  = 7ème = 7th  = 1 WT below Octave  = octave moins 1 Ton


    9th CHORD = 5 NOTES (R   3    5    7  and  9th) like C9
                                        (C   E   G    Bb        D )
   9   = 9ème =  9th = 1 WT Above Octave = Octave+1 Ton

        Next intervals ...see below