In the pursuit of improvisation (jazz or other styles), scales are the “palettes” utilized for creating melodies. Often, scales are only practiced ascending or descending step-wise. “Jazz Scale Workout” by Ken Karsh contains eight measure through-composed continuous eighth note exercises (or “workouts”) utilizing “jazz style” melodies based around the Major, Dorian (minor seventh), Mixolydian (Dominant), and Super-Locrian (Altered Dominant) scales—the most common scales in the jazz idiom.