In Part 18 of the Jazz Bass Lecture, we will focus on chord exercises using the half-position to seventh position that we have learned so far. Chord exercises" are used to understand and master harmony, which is an important element of music. The jazz bass line uses all chord tones, not just the root, to build the line. The content is designed to provide not only an understanding of the notes, but also a comprehensive grasp of positions and fingerings. The exercises presented here are designed to help you understand and play chords in three dimensions. This is an essential practice menu for bassists who have the problem of "always playing the same bass line due to a habit of playing the same chords!